Some links on this page are affiliate links: if you buy through them we may earn a commission, at no extra cost to you.
Error 0x009C4958 has no published, code-specific meaning in the Microsoft activation and Windows upgrade tables reviewed for Windows 11 and Windows 10. Do not assume it is an activation, update, driver, or blue-screen error from the hexadecimal string alone. The correct fix depends on where it appeared: Activation, Windows Update, Windows Setup, an application, or a device.
First record the exact message, the screen or program showing it, and what Windows was doing. Then use Microsoft’s Error Lookup Tool to translate the value. Apply the troubleshooting branch that matches the original context, and escalate an unlisted activation result to Microsoft rather than applying an unrelated repair.
As an Amazon Associate I earn from qualifying purchases.
Recommended Free Tools
What is error 0x009C4958?
It is a hexadecimal status value, but Microsoft does not publish a specific explanation or universal fix for 0x009C4958 in the activation or Windows upgrade documentation reviewed for this guide. The same-looking value can be surfaced by different components, so the number by itself cannot establish the cause.
Microsoft’s activation guidance says that codes not listed in its activation table should be taken to customer support. Its upgrade guidance also warns that the documented 0xC1900101 family is usually driver-related; 0x009C4958 does not have that prefix and should not be classified as one of those driver errors without evidence from the screen or log where it appeared.
Popular on Amazon
- BLUE LIGHT BLOCKING GLASSES: Our blue light glasses for women boast UV400 protection, blocking harmful blue rays from computer screens. With these bluelight glasses women, you can enjoy gaming, reading, or watching TV with no worries of eye strain.
- EYE RELIEF: Our blue light glasses are engineered to reduce blurry vision or strain caused by prolonged screen time. These womens blue light glasses aid in better sleep by preventing blue light from disrupting your natural sleep cycle, helping you fall asleep faster and enjoy a more restful night's sleep, making them the perfect christmas present.
- COMFORTABLE: Crafted from durable material, our trendy blue light glasses for woman or blue light glasses men ensure long-lasting comfort. The high-transmittance lenses accessories, gamer gifts for men, help keep your eyes relaxed. Perfect stocking stuffers, gifts for gamers men, christmas gifts for men, halloween costumes.
- LIGHTWEIGHT: These clear blue light glasses feature a lightweight frame, meaning they’ll stay comfy for long-term wear. Perfect as blue blockers glasses for women or mens blue light glasses, these non-prescription fake glasses for men can be worn throughout the day. The blue light blocking glasses women feature polycarbonate HD lenses, which are anti-reflective and restore true color.
- WORRY-FREE PURCHASE: If you experience any issues, our support team is ready to assist you quickly. These are the perfect costume glasses for cosplay dressing up.
Where did the code appear?
Identify the location and timing before changing system files or reinstalling Windows. Use this comparison to select the right branch.
| Location | Useful details to record | First action |
|---|---|---|
| Activation settings | Windows edition, the complete message, and whether it appeared before or after running the troubleshooter | Install pending updates, then run the Activation troubleshooter |
| Windows Update | Whether the failure happened while checking, downloading, installing, or restarting | Back up files and follow Microsoft’s update sequence |
| Windows 11 setup or upgrade | Setup phase, percentage reached, and any rollback message | Remove nonessential hardware and software, then update Windows and hardware drivers |
| An application or game | Program name, launch or in-game action, and whether other programs work | Keep the application’s exact message and check its own support and logs |
| Device Manager or a device | Device name, category, and whether the device stopped working after a change | Record the device and driver details before changing or rolling back drivers |
| Boot or a blue screen | Stop-screen text, restart behavior, and whether Safe Mode reaches the desktop | Photograph the screen and preserve the stop code and dump information |
If you cannot identify the context, do not perform a blanket registry cleanup or delete system folders. The most useful evidence is a screenshot, the complete sentence beside the code, the time it occurred, and the action that immediately preceded it.
Free tools Windows power users keep installed
One-click scans. No signup required.
How can Microsoft decode 0x009C4958?
Microsoft’s Error Lookup Tool displays the message text associated with a hexadecimal status code. It can return a named constant or message when the value exists in the tool’s Microsoft error-header data.
- Download version 6.4.5 of the Microsoft Error Lookup Tool from the Microsoft Download Center.
- Place
Err_6.4.5.exesomewhere convenient, such as your Downloads folder. - Open Command Prompt and change to that folder, or run the executable from there.
- Enter
Err_6.4.5.exe 0x009C4958and press Enter. - Save the returned constant or message with a screenshot of the original error.
The utility is a downloadable diagnostic program, not a repair product. Its database reflects the release in which it was compiled; a later Windows release can add codes that an older copy does not know. If it reports no matching text, that is evidence that this value is not present in that version’s data, not proof that Windows is damaged.
How do I fix 0x009C4958 when it appears in Windows Update?
Back up personal files first. Microsoft recommends a sequence that checks the update environment before you remove cached data.
Also popular on Amazon
- WINDEX GAMING WIPES: effortlessly clean all your gaming gear and gaming electronics in one easy step with our new Windex Gaming Wipes
- AMMONIA FREE: our ammonia-free formula is safe to use on all of your favorite gaming equipment like consoles, headsets, controllers, screens, keyboards, and more
- PRE-MOISTENED WIPES: each wipe instantly removes dust, dirt, and stubborn smudges and fingerprints leaving a streak-free shine
- ANTI-STATIC: great for cleaning and wiping down your gaming gear and electronics leaving behind no visible residue
- COMPACT RESEALABLE PACKAGE: store your pack of Windex Gaming Wipes anywhere in your home for whenever a quick and easy wipedown is needed
- Connect the PC to reliable power and a stable Internet connection. Sign in with an administrator account.
- Run the Windows Update troubleshooter from Windows Settings and apply any recommended correction.
- Disconnect nonessential USB devices, external drives, docks, printers, and other hardware while updating.
- Check that date, time, time zone, and automatic time synchronization are correct.
- Install available third-party hardware-driver updates from the device maker, especially if the failure began after a hardware change.
- Confirm adequate free space. Microsoft’s upgrade guidance specifies at least 16 GB for a 32-bit upgrade and 20 GB for a 64-bit upgrade; Windows Update may require additional working space for a particular package.
- If the troubleshooter does not clear the failure, stop the Windows Update service, open
C:WindowsSoftwareDistribution, and clear its contents. Start the service again and retry the update. Do not delete the parentWindowsfolder. - Restart the PC and try the update once more. Keep the original message and any new code if the attempt fails.
Do not interpret a successful cache reset as proof that 0x009C4958 has a single known cause. It only refreshes downloaded update data; a recurring failure can still be caused by connectivity, storage, a driver, or the update package itself.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →What should I do if it appeared during a Windows 11 upgrade or installation?
Use Microsoft’s general upgrade procedure rather than treating this value as a documented driver code.
- Back up personal files and ensure the installer has a stable power source.
- Unplug nonessential external hardware, including storage devices, printers, cameras, and hubs.
- Install important Windows updates and available hardware-driver updates before starting the upgrade.
- Temporarily remove non-Microsoft antivirus software for the upgrade, following that product’s uninstall instructions. Reinstall or re-enable protection after Windows finishes and is stable.
- Uninstall nonessential software that could interfere with setup, particularly utilities installed shortly before the failure.
- Free disk space and retry the installation. Keep the setup phase, percentage, and rollback text if it fails again.
Microsoft groups codes beginning with 0xC1900101 as usually related to drivers. Because 0x009C4958 does not begin with that documented prefix, use the setup context and logs to establish a driver connection instead of applying that label automatically.
How do I handle 0x009C4958 in Activation settings?
Activation codes can change after troubleshooting, so record both the initial value and any replacement value.
- On Windows 11, open Settings > System > Activation. On Windows 10, open Settings > Update & Security > Activation.
- Install any pending Windows updates, restart, and return to the Activation page.
- Select Troubleshoot and follow the prompts for the installed edition and digital license.
- Write down the code shown after the troubleshooter completes and compare that resulting code with Microsoft’s activation-error table.
- If the resulting code is still not listed, contact Microsoft customer support with the exact message, Windows edition, device history, and the time the error occurred.
Do not enter random product keys or perform an edition change solely because the hexadecimal value looks unfamiliar. An unlisted activation value requires Microsoft’s account and licensing records to diagnose.
Also popular on Amazon
- Ergonomic & Adjustable Design: Fight "text neck" and improve your posture. Designed for comfort, it offers an adjustable height (7.1in-8.5in) (1.4in adjustable range) and angle (5°-85°) Please note: cell phone stand is only 9 inches tall—the length of a standard pencil
- Without blocking subtitles Perfect for office desk Tiktok Face Time Zoom video—this is the ultimate kitchen desk essential for phones! Perfect viewing experience while reducing neck back strain, A must-have for gamers streamers desk, and anyone who values both style and support!
- Sleek & Stable Design fits Otterbox Case: Say goodbye to bent cables, tangles, and tip-overs! LISEN’s stylish adjustable desk phone holder features a built-in charging hole and smart cable management, keeping your phone secure and your workspace clutter-free cool gadgets for men
- ANTI-SLIP DESIGN free hands: The under 10.00 items easy gadgets back and the bottom of this kitchen essentials for women are fully covered by anti-skid silicone, which LISEN stand up desk decor can provide maximum protection device from any scratches and slides
- Your Perfect Viewing Companion:If your product arrives damaged or breaks within 365 days, reach out to LISEN for a quick and hassle-free solution. Struggling with assembly, like tightening the screw? We’ve got your back! Your experience matters to us. (Product including: phone Holder stand*1, screw*1, hexagon screwdriver*1, specification*1)
What if the code appears in an app, game, or device error?
For an application, capture the program name, version, action that triggered the message, and whether the error repeats after a restart. Check that application’s own support instructions and logs; the hexadecimal value does not identify a Windows-wide cause by itself.
For a device or Device Manager entry, record the device category, manufacturer, current driver version, and the date the problem began. If the issue followed a driver update, use the device’s driver properties to review whether a rollback is available; if it followed new hardware, shut down and reseat or disconnect the hardware only when the manufacturer’s instructions permit it. Avoid installing a random driver package based only on the code.
If Windows shows the value during boot or on a blue screen, photograph the complete stop message before restarting. Note whether Windows reaches the desktop normally or only in Safe Mode, because that distinction determines whether the next investigation should focus on startup software, a device, or the operating-system installation.
When should I contact Microsoft?
Contact Microsoft when Error Lookup Tool returns no useful constant, when the code appears in Activation and remains absent from Microsoft’s table after troubleshooting, or when Windows Update or Setup continues to fail after the relevant sequence. Provide the exact hexadecimal value, full surrounding text, edition (Windows 11 or 10), 32-bit or 64-bit architecture where known, and the operation that produced it. A screenshot and the time of failure are more useful than the number alone.
Keep a record of every changed condition—unplugged hardware, removed software, cleared update cache, or installed driver—so support can distinguish a transient retry from a reproducible failure.
Also popular on Amazon
- Easy Installation: Our gaming lights have been designed to enhance your entertainment experience. Simply position the led light bar next to your TV or game console to create a game room environment with ease. They come with USB power and a 60 inch cord for direct mounting and mobility
- Audio Syncing & Extensive Mode: The built-in high-sensitivity music sensor allows you to sync the TV led lights to your favorite music. Lights react and move to the beat of music, film and game audio, creating an incredible immersive sound and light experience – and all without the need for an additional hub. You can choose from 64+ patterns, including strobe, illusion, jump, energy, gradient, running, chasing, fluttering mode etc. Each mode can be applied to different scenes
- 64+ Chasing IC+RGB & W Effect: The independent control design of IC+RGB and white all-in-one multifunctional rgbw led bar lights monitor backlight allows you to easily switch the led lights for desk between IC+RGB and white to enjoy a variety of lighting effects, you can choose white lighting mode with high brightness for better illumination when working, etc. Choose IC+RGB lighting mode when you need to create an entertaining atmosphere for the light show, 16 million colours of Color changing rgb light bar let you dance to the beat and create a dynamic party atmosphere
- Dynamic and Dimmable Lights: 1%-full brightness free brightness adjustment gives you the flexibility to adjust dimmable led light bar for room decorations or a variety of occasions
- USB Powered: USB light bars for room can be powered by powernank, usb charger, TV, Monitor, laptop PC mainframe, making behind TV led lighting bar easy to install in any location.TV led lights are powered by the TV usb interface / PC mainframe, can be turned on/off synchronously with TV / PC
As an optional shortcut after the manual checks, Outbyte PC Repair can look for more than 100 common Windows issues, including broken system elements, invalid redirects and shared DLL problems, while also offering cleanup and diagnostic features. It runs on Windows 11, 10, 8 and 7; its category-based free trial lasts at least two days before a subscription, and it complements antivirus software rather than replacing it. Results vary, and no tool repairs every crash.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently asked questions
Is 0x009C4958 a virus or malware warning?
The hexadecimal string alone does not identify malware. Treat it as an unknown status value until you establish which Windows component or application displayed it, and use your normal security software and trusted support channels for any separate security concern.
Do I need to reset or reinstall Windows immediately?
No. Microsoft has no code-specific reset instruction for this value, and reinstalling before recording the context can destroy useful evidence. Try the branch that matches Activation, Update, Setup, an application, or a device, and preserve the original message.
Can the Error Lookup Tool repair the problem?
No. It translates hexadecimal status values into available Microsoft constants and message text. The output helps select a diagnostic path but does not change Windows files, licensing, updates, or drivers.
Why did the code change after I ran Activation Troubleshooter?
Microsoft notes that activation codes can change after troubleshooting. Record the new value and compare that value—not only the original screen—to the current activation table before contacting support.
What information should I send with a support request?
Include the complete message, a screenshot, Windows edition and version, where the code appeared, what action triggered it, whether the desktop still loads, and the result from Error Lookup Tool version 6.4.5. Mention any update, driver, antivirus, hardware, or software change made immediately before the failure.
Also popular on Amazon
- Compatible with Wide Screens - To ensure compatibility with the dual monitor mount, your each monitor must meet three conditions at the same time: First, computer screens size range: 13 to 32 inches. Second, screen weight range: 4.4 to 19.8 lbs. Third, the back of the monitor screen must have VESA mounting holes with a pitch of 75x75mm or 100x100mm.
- Regarding the compatibility with desks - Your desk must meet three conditions at the same time: First, desk material: Only wooden desks are recommended, plastic or glass desks cannot be used. Second, desk thickness range: 0.59" - 3.54". Third, the bottom of the desk should not have any cross beams or panels, as this will interfere with installation. We recommend carefully checking that your desk and monitors meets all above conditions before purchasing.
- Dual C-Clamp Hold - Worried your dual monitors might wobble or slip? Our upgraded base uses a larger platform plus a dual C-clamp structure to lock the dual monitor arm firmly to your desk. Each arm safely keeps your screens steady while you type, click and game—no shaking, no sliding, just a clean and secure setup you can trust every day. It also provides Grommet Mounting installation choice, both options ensure stable and secure fixation for your 0.59" - 3.54" desk.
- Full-Motion Adjustment For Comfortable View - Pull the screen closer when you’re deep in a spreadsheet, push it back to watch videos, or rotate to portrait for coding — moving everything smoothly with just one hand. The monitor stand offers +85°/-50° tilt, ±90° swivel and 360° rotation. Raise your monitor up to 15.75″ to support a healthy sitting posture. Whether you’re working from home, gaming through the night, or switching between video calls and documents, getting the screens to your natural line of sight helps relieve neck, shoulder and back strain so you can stay focused longer with less fatigue.
- Keep Your Desk Organized: By lifting both screens off the desktop, this dual monitor stand opens up valuable space for your keyboard, notebook, docking station or a simple, clutter-free work area. Built-in cable management guides wires along the arms, keeping cords out of sight and out of the way. Enjoy a tidy, modern workstation that looks as good as it feels to use.
Frequently Asked Questions
Is 0x009C4958 a virus or malware warning?
The hexadecimal string alone does not identify malware. Treat it as an unknown status value until you establish which Windows component or application displayed it, and use your normal security software and trusted support channels for any separate security concern.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Do I need to reset or reinstall Windows immediately?
No. Microsoft has no code-specific reset instruction for this value, and reinstalling before recording the context can destroy useful evidence. Try the branch that matches Activation, Update, Setup, an application, or a device, and preserve the original message.
Can the Error Lookup Tool repair the problem?
No. It translates hexadecimal status values into available Microsoft constants and message text. The output helps select a diagnostic path but does not change Windows files, licensing, updates, or drivers.
Why did the code change after I ran Activation Troubleshooter?
Microsoft notes that activation codes can change after troubleshooting. Record the new value and compare that value—not only the original screen—to the current activation table before contacting support.
What information should I send with a support request?
Include the complete message, a screenshot, Windows edition and version, where the code appeared, what action triggered it, whether the desktop still loads, and the result from Error Lookup Tool version 6.4.5. Mention any update, driver, antivirus, hardware, or software change made immediately before the failure.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsQuick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
