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“The program can’t start because cnb_0275.dll is missing from your computer. Try reinstalling the program to fix this problem.”
If Windows reports that cnb_0275.dll cannot be found, loaded, or is not designed to run on Windows, the file is usually part of a Canon printer driver installation rather than a Windows runtime.
Which fix applies to you
Use the situation that matches what you see:
- The error appears when printing or opening Canon printer software: reinstall the driver for the exact Canon model.
- It appeared after removing and reinstalling the printer: remove the old printer package completely, restart, and install a fresh driver.
- It started after Windows Update: install pending updates, restart, and retry the Canon installation.
- Windows Security quarantined the file: inspect Protection history before restoring anything.
- Several Windows programs also report missing or damaged files: repair Windows with DISM and SFC.
- The printer is old or no longer supported: check the model’s Canon support page for Windows compatibility.
- You downloaded cnb_0275.dll from a random site: delete that copy and use a complete Canon driver package instead.
Do not begin by copying a loose DLL into System32 or SysWOW64. That may place the file in the wrong directory, use the wrong architecture, or leave the actual Canon driver package damaged.
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What cnb_0275.dll is
cnb_0275.dll is associated with the Canon Inkjet Printer Driver. It is a printer-driver component installed by Canon software, not a general-purpose Windows system DLL and not a Visual C++, DirectX, or .NET runtime file.
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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →A Windows component-store report has associated CNB_0275.DLL with a Canon driver package identified as prnca00f.inf. That evidence comes from an older Windows environment, so it should not be treated as a universal current installation path.
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The file may be stored inside the Canon driver package or Windows DriverStore rather than directly in C:WindowsSystem32. The correct location depends on the printer model, driver package, Windows architecture, and installation state.
The filename alone cannot identify which Canon printer installed it. Do not assume that every Canon model uses the same package.
32-bit and 64-bit considerations
A 32-bit Canon component can use a 32-bit DLL even when Windows is 64-bit. Conversely, a 64-bit driver package may require a different build. The bitness of Windows does not tell you which replacement file is correct.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallPublic file records also show conflicting versions, sizes, and hashes for cnb_0275.dll. Those differences may represent different builds, but they are not authoritative instructions for replacing the file. Use the complete driver package selected for your model and Windows version.
Fix 1: Reinstall the exact Canon printer driver
This is the most likely solution because the error usually means the Canon driver installation is incomplete, removed, corrupted, or mismatched.
Remove the printer
- Disconnect the printer’s USB cable if it is connected.
- Open Settings.
- Select Bluetooth & devices in Windows 11, or Devices in Windows 10.
- Open Printers & scanners.
- Select the affected Canon printer.
- Choose Remove or Remove device.
- Confirm the removal.
If the printer is not listed:
- Press
Windows key + R. - Enter
control printers. - Press Enter.
- Right-click the Canon printer if it appears.
- Select Remove device.
Remove old Canon software
- Press
Windows key + R. - Enter
appwiz.cpl. - Press Enter.
- Look for Canon MP Drivers, Canon printer software, or another Canon package belonging to the affected printer.
- Select it and choose Uninstall.
- Follow the removal wizard.
- Restart Windows.
If the Canon package is not listed, continue anyway. The driver may still be present in the Windows driver store and can be replaced when the new package is installed.
Download and install the replacement
Use Canon’s official support site, select your region, search for the exact printer model, and choose the driver for your Windows version and system architecture. Do not select a visually similar model.
Then:
- Download the complete Canon driver package.
- Right-click the installer and select Run as administrator.
- Follow the installation prompts.
- Connect the printer only when the installer requests it.
- Restart Windows if prompted.
- Print a Windows test page.
To print a test page, open Settings → Bluetooth & devices → Printers & scanners, select the Canon printer, choose Printer properties, and select Print Test Page.
If the test page prints, the driver package has restored the missing dependency. If the same error returns, continue with the next fixes rather than copying cnb_0275.dll manually.
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- Effortless Setup & Use - Get started quickly with easy setup for your smartphone or computer, so you can print, scan, and copy without delay
- Reliable Wireless Connectivity - Enjoy stable and consistent connections with dual-band Wi-Fi (2.4GHz or 5GHz), ensuring smooth printing from anywhere in your home or office
- Scan & Copy Handling - Utilize the device’s integrated scanner for efficient scanning and copying operations
When manually hunting through model pages and comparing driver packages is taking longer than expected, Outbyte Driver Updater can scan for outdated or missing drivers; its free scan shows what it finds, while driver installation through the full version is optional and not required for the Canon support route.
Fix 2: Install pending Windows updates
Windows Update may provide a compatible printer driver or repair related driver-store components.
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- Select Windows Update.
- Choose Check for updates.
- Install all available updates, including optional driver updates if they identify your Canon printer.
- Restart Windows.
- Try printing again.
Windows 10 users can open Settings → Update & Security → Windows Update and select Check for updates.
Microsoft recommends Windows Update as the preferred way to obtain many printer drivers. If Windows Update does not find the correct package, use the exact model-specific Canon driver instead.
Fix 3: Install the driver through Device Manager
Device Manager can help when Windows detects the printer but the driver is not loading correctly.
- Right-click Start.
- Select Device Manager.
- Expand Printers, Print queues, or Universal Serial Bus controllers.
- Locate the Canon printer or an entry with a warning icon.
- Right-click it and select Uninstall device.
- If Windows displays Attempt to remove the driver for this device, select it.
- Choose Uninstall.
- Restart Windows.
- Install the current Canon package again.
If Device Manager shows only a generic printer entry, do not force a driver from an unrelated Canon model. Cancel the wizard and obtain the correct package by model.
Fix 4: Repair Windows components with DISM and SFC
Use these commands when the cnb_0275.dll error appears alongside broader Windows corruption, failed updates, or other protected system-file errors. They repair Windows components, not necessarily a third-party Canon DLL.
- Open Start.
- Type
Command Prompt. - Right-click Command Prompt.
- Select Run as administrator.
- Run:
DISM /Online /Cleanup-Image /RestoreHealth
- Wait for it to finish.
- Then run:
sfc /scannow
- Restart Windows.
- Retry the Canon driver installation.
DISM should run before SFC because SFC may need a healthy Windows component source. If SFC reports that it repaired files, restart and test the printer. If it reports that some files could not be repaired, repeat the Canon driver removal and installation steps rather than downloading the DLL separately.
If you prefer not to keep repeating DISM and SFC without knowing what changed, Outbyte PC Repair can scan Windows for issues; its free scan identifies problems, while repair through the full version is optional and not required for Microsoft’s built-in commands.
Fix 5: Check Windows Security quarantine
Antivirus software can remove a driver component if it detects a problem with the installer or installed file.
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- Open Windows Security.
- Select Virus & threat protection.
- Choose Protection history.
- Look for an event mentioning Canon software or cnb_0275.dll.
- Expand the event and review its source and action.
Restore the file only when the installer came directly from Canon or Windows Update and you are confident it is legitimate. Do not repeatedly restore a file that Windows Security keeps detecting.
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If the file is repeatedly quarantined:
- Stop restoring it.
- Run a full scan from Virus & threat protection → Scan options.
- If necessary, run Microsoft Defender Offline.
- Remove the Canon package.
- Download a fresh installer from Canon’s official support page.
- Install again.
A quarantined file may also indicate that the installer was altered or that the driver package is incompatible with the current Windows installation.
Fix 6: Use System Restore after a recent driver change
System Restore is appropriate when the error began immediately after a printer-driver update, Windows change, or software installation.
- Press
Windows key + R. - Enter:
rstrui.exe
- Press Enter.
- Select Next.
- Choose a restore point from before the error began.
- Select Scan for affected programs if available.
- Review the changes.
- Select Next, then Finish.
- Allow Windows to restart.
System Restore does not replace the need for a compatible Canon driver. After restoring, install the correct current package if Windows still cannot print.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhy regsvr32 usually does not help
regsvr32 is used for DLLs that provide registration entry points such as DllRegisterServer. A printer-driver dependency is not automatically a self-registering DLL.
Running this command is therefore normally irrelevant:
regsvr32 cnb_0275.dll
If it reports that DllRegisterServer was not found or the entry point failed, that does not prove the file belongs in System32. It means the DLL does not expose the interface that regsvr32 expects.
Only use regsvr32 when the software vendor’s documented installation procedure specifically requires it.
Why standalone DLL downloads fail
Downloading cnb_0275.dll from a third-party DLL archive is unsafe and often ineffective because:
- the file may contain malware or be modified;
- it may belong to another Canon driver build;
- it may be the wrong 32-bit or 64-bit version;
- it may require other missing driver dependencies;
- copying it does not recreate the Canon package, services, printer queues, or registry configuration;
- Windows may continue loading the broken driver path.
The safe sources are Windows Update and the official Canon support page for the exact printer model. Install the package, not an isolated DLL.
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If the error remains
Check these details before trying another repair:
- Confirm the exact Canon model from its label or printer settings.
- Confirm whether Windows is 32-bit or 64-bit under Settings → System → About → System type.
- Note whether the error appears during printing, when opening Canon software, during installation, or at startup.
- Check whether the issue affects every Windows account or only one.
- Remove old Canon software again and restart before retrying.
- Temporarily disconnect the printer if the Canon installer requests it.
- Test a fresh Windows user profile if the problem affects only one account.
- Check Canon’s compatibility information if the printer is no longer supported.
Windows Features is not the right repair location for this file. Enabling .NET Framework or other optional Windows components will not restore a Canon printer-driver DLL unless a separate application specifically requires that feature.
FAQ
Is cnb_0275.dll a Windows system file?
No. It is associated with a Canon printer-driver package. It should not be treated like a protected Windows DLL that belongs universally in System32.
Which Canon printer installed it?
The filename cannot identify the individual model. Reinstall the driver selected for the printer’s exact model rather than searching for the DLL by name.
Should I copy it to System32 or SysWOW64?
No. The correct copy may be inside the Canon package or DriverStore, and a 32-bit printer component can run on 64-bit Windows. Let the official installer place its files.
Can SFC restore cnb_0275.dll?
Usually not. SFC repairs protected Windows components. It may help with related Windows corruption, but a missing Canon-specific file normally requires reinstalling the Canon driver.
What if the error appears at Windows startup?
Look for leftover Canon software in Settings → Apps → Startup or Task Manager → Startup apps, then reinstall or remove the associated Canon package. If the printer is no longer used, uninstalling its remaining software is preferable to replacing the DLL.
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Does regsvr32 fix the error?
Normally no. It applies to self-registering DLLs and does not repair an incomplete printer-driver installation.
Prevention
Keep the printer’s exact model number available, install drivers only from Canon or Windows Update, and avoid driver-cleaner utilities that remove files without identifying the package they belong to. After major Windows updates, verify that the printer still appears under Printers & scanners and print a test page before deleting old installation media.
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