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A VALORANT blue screen is usually a Windows kernel-level failure, not an ordinary game crash. Riot Vanguard may be involved because it operates at kernel level, but a crash that mentions vgk.sys does not automatically prove Vanguard is the root cause. Unstable RAM, overclocking, firmware, TPM or Secure Boot configuration, GPU and chipset drivers, storage problems, antivirus, overlays, and other kernel drivers can all be responsible.
Use this order: record the stop code, update Windows and official drivers, return the PC to stock settings, test memory and system files, verify firmware and security requirements, then reinstall Vanguard and isolate third-party software.
First, identify what is actually failing
Not every VALORANT-related failure is a blue screen. Distinguish between:
- BSOD: Windows shows a blue stop screen with a code such as
PAGE_FAULT_IN_NONPAGED_AREA,MEMORY_MANAGEMENT,IRQL_NOT_LESS_OR_EQUAL, orKERNEL_SECURITY_CHECK_FAILURE. - Hard reboot: The computer restarts without displaying a blue screen. This can indicate power, firmware, thermal, or hardware instability.
- Game crash: VALORANT closes to the desktop while Windows remains usable.
- Vanguard restriction: A
VANcode or security message without a Windows stop error. This requires a different troubleshooting path. - Black screen or display reset: Often points toward the GPU driver, graphics hardware, power, or thermals rather than Vanguard alone.
A Kernel-Power 41 event generally means Windows did not shut down cleanly. It records the unexpected shutdown; it does not, by itself, identify the cause.
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Timing provides an important clue
| When it happens | Areas to investigate first |
|---|---|
| Immediately after pressing Play | Vanguard installation, incompatible drivers, security software, TPM/Secure Boot, or corrupted client files |
| During a match | GPU or chipset drivers, overheating, RAM, power delivery, or unstable overclocking |
| When closing VALORANT | Driver unloading, overlays, RGB or peripheral utilities, and Vanguard service conflicts |
| After a Windows or BIOS update | Changed drivers, firmware compatibility, or security configuration |
| In other games too | General hardware, driver, thermal, PSU, storage, or memory instability |
| Only in VALORANT | Vanguard or an application-specific conflict is more plausible, but not proven |
Record the stop code and failing module
Write down the exact Stop code and the filename shown beside What failed. Also note whether the problem began after a Windows update, BIOS update, new driver, RAM change, overclock, or newly installed utility.
If Windows restarts too quickly to read the error:
- Press Windows + R and enter
sysdm.cpl. - Open Advanced → Startup and Recovery → Settings.
- Clear Automatically restart.
Check C:WindowsMinidump for crash dumps. A dump containing vgk.sys shows that Vanguard was active near the crash. It is a useful lead, not conclusive proof that Vanguard caused the fault; the original problem may be another driver, unstable memory, or firmware.
For additional evidence, open eventvwr.msc for Event Viewer, perfmon /rel for Reliability Monitor, msinfo32 for system and firmware information, dxdiag for graphics details, and mdsched.exe for Windows Memory Diagnostic. Microsoft recommends these tools, along with dump analysis, for recurring stop errors (Microsoft’s BSOD guidance).
Low-risk fixes to try first
1. Protect your recovery options
Before changing BIOS settings, TPM, Secure Boot, or boot mode:
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problems- Back up important files.
- Make sure you can access your BitLocker or device-encryption recovery key.
- Photograph or record current BIOS settings.
- Do not clear or reset the TPM casually.
- Do not flash BIOS until the exact motherboard or laptop model and revision are confirmed.
Changing TPM, Secure Boot, or firmware settings can trigger a BitLocker recovery prompt.
2. Update Windows
Open Settings → Windows Update → Check for updates, install available updates, and restart after installation completes. Riot’s support guidance also recommends updating Windows when Vanguard dependencies fail to install or start.
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3. Update official hardware drivers
Use the support page for your laptop, desktop, or motherboard first. Prioritize:
- Chipset and motherboard drivers
- GPU drivers
- Storage or NVMe drivers and firmware
- Network and audio drivers
- BIOS/UEFI firmware, but only when the manufacturer documents a relevant compatibility or stability fix
Laptop vendors may customize power, thermal, chipset, and graphics behavior, so an OEM-validated driver can be a better first choice than a generic package. Avoid driver-download sites and automatic “driver fixer” utilities.
4. Return the PC to stock settings
Temporarily disable CPU, GPU, or RAM overclocks, undervolts, XMP/EXPO memory profiles, and third-party tuning tools. Also close or temporarily remove kernel-level monitoring, RGB, fan-control, motherboard-management, and peripheral software. This is a diagnostic step, not a recommendation to permanently weaken Windows security.
Repair Windows and test the hardware
Repair system files
Open Windows Terminal or Command Prompt as administrator and run:
DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannowRestart when both commands finish. For a possible storage problem, begin with the less disruptive scan:
chkdsk /scanUse chkdsk C: /f only when a repair is justified; Windows may schedule it for the next restart. Do not treat chkdsk /r as a routine first step. It can take a long time and place additional workload on a failing drive.
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Test memory
Run mdsched.exe and choose the option to restart and test. If errors appear:
- Remove XMP or EXPO.
- Test each memory module separately.
- Use the motherboard’s recommended memory slots.
- Run a longer bootable memory test if needed.
- Replace or warranty-test defective RAM.
A clean test does not prove memory is perfect under every workload, but an error is strong evidence that hardware stability must be addressed before blaming VALORANT.
Also check for overheating, visual artifacts, sudden power loss, and WHEA errors in Event Viewer. If other games or unrelated workloads also crash, prioritize RAM, GPU, PSU, motherboard, storage, and thermals over a Vanguard reinstall.
Check TPM 2.0, UEFI, and Secure Boot
Windows 11 VALORANT operation requires TPM 2.0 and UEFI Secure Boot according to Riot’s current support material. Riot also uses these requirements in certain Vanguard restriction states. A missing requirement normally produces a Vanguard restriction rather than proving it caused a BSOD.
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Check TPM
- Press Windows + R.
- Enter
tpm.msc. - Confirm that the TPM is present and ready for use.
- Check that the specification version is 2.0 where required.
You can also open Windows Security → Device security → Security processor details. See Riot’s TPM 2.0 guide.
Check UEFI and Secure Boot
- Press Windows + R and enter
msinfo32. - Check BIOS Mode; it should show
UEFIwhere required. - Check Secure Boot State; it should show
Onwhere required.
Do not switch blindly from Legacy/CSM to UEFI. First confirm that the Windows system disk uses GPT and that your BitLocker recovery information is available. BIOS menus differ across ASUS, MSI, Gigabyte, ASRock, Dell, HP, Lenovo, and other manufacturers. Follow the exact instructions for your model.
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Changing boot mode or Secure Boot can expose problems with legacy installations, unsupported option-ROM devices, or custom bootloaders. Do not change unrelated firmware options. Riot’s Vanguard restriction guidance includes the relevant UEFI, Secure Boot, motherboard, and MBR/GPT cautions.
Determine whether Vanguard is the trigger
Compare system behavior in three situations: normal Windows use, another game, and VALORANT. If only VALORANT crashes and the dump repeatedly references vgk.sys, Vanguard or a conflict with Vanguard becomes more plausible. If every demanding workload crashes, investigate general system stability first.
Uninstalling Vanguard and seeing the crash disappear establishes a strong correlation, but not necessarily sole causation. Vanguard may expose an already unstable driver or firmware path. Community reports frequently mention vgk.sys in VALORANT-related dumps, but those reports are support diagnoses rather than proof that every such crash has the same cause (example report, another report).
Cleanly reinstall Riot Vanguard
- Open Settings → Apps → Installed apps.
- Find Riot Vanguard and select Uninstall.
- Restart the PC.
- Launch VALORANT or reinstall it using the official installer so Vanguard is installed again.
- Restart again if prompted.
- Test several launches and matches before restoring overlays or tuning utilities.
Riot’s support sequence for dependency or anti-cheat installation problems is to update Windows, uninstall VALORANT and Vanguard, restart, and reinstall through the official installer (Riot support).
If the normal uninstaller fails, use Riot’s current support instructions. Avoid copying old guides that manually delete Vanguard services or replace vgk.sys; those commands can become outdated and can damage the installation.
Isolate third-party conflicts with a clean boot
Use Microsoft’s current clean-boot procedure to disable non-Microsoft services and startup programs, then test VALORANT. Pay particular attention to:
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- GPU overlays and monitoring tools such as Afterburner- or RivaTuner-type utilities
- RGB, fan-control, motherboard, and peripheral suites
- Third-party antivirus
- VPN clients
- Virtualization and sandbox tools
- Other anti-cheat software
- Audio-enhancement software
- Backup, encryption, and other filter drivers
Riot’s launch troubleshooting guidance also covers clearing local cache, clean booting, checking firewall exceptions, updating the GPU driver, and reinstalling the game or Vanguard.
What to do if Windows will not boot
If repeated crashes prevent normal startup, interrupt boot twice by powering off during startup. Windows should enter the Recovery Environment on the next start. Select Troubleshoot → Advanced options → Startup Settings → Restart, then choose Safe Mode.
From Safe Mode, remove the recently installed driver, utility, or Vanguard installation, or use System Restore to return to a known-good state. If you enabled Driver Verifier and Windows is stuck in a boot loop, open an administrator Command Prompt in Safe Mode or Recovery Environment and run:
verifier /resetDriver Verifier intentionally stresses drivers and can provoke crashes. Do not enable it for all drivers casually; use it only when you understand the recovery process and are prepared to analyze the resulting dump.
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- Riot Support: VALORANT-only crashes, Vanguard errors, or cases where Riot logs are needed. Riot’s official Repair Tool can collect logs: Riot Repair Tool. It collects evidence; it is not a guaranteed BSOD repair.
- Microsoft: recurring Windows stop codes, dump interpretation, recovery, or system-file problems.
- PC or motherboard manufacturer: BIOS, TPM, Secure Boot, chipset, storage firmware, and model-specific drivers.
- Hardware repair service: failed memory tests, crashes outside VALORANT, repeated WHEA errors, power loss, overheating, or a computer that cannot boot.
Fixes to avoid
- Do not grant broad permissions to
vgk.sys. - Do not download a replacement
vgk.sys. - Do not permanently disable Secure Boot, TPM, Memory Integrity, or antivirus as a blanket fix.
- Do not clear the TPM without understanding BitLocker recovery consequences.
- Do not repeatedly run
chkdsk /rwithout evidence of disk trouble. - Do not flash BIOS with an image for a different model or revision.
- Do not install registry cleaners, unofficial driver updaters, or “one-click BSOD repair” tools.
Microsoft’s guidance for incompatible drivers and Memory Integrity is to obtain an updated driver from the publisher or remove the incompatible software, rather than assuming the Windows security feature is defective (Windows Device Security).
Frequently Asked Questions
Does vgk.sys always mean Vanguard is broken?
No. It means Vanguard was active near the crash. The underlying cause may be another driver, unstable RAM, firmware, an overclock, storage, or a conflict with security software.
Is VAN 9003 the same as a BSOD?
No. A VAN restriction is a Vanguard security or configuration error. A BSOD is a Windows stop error. Check TPM, UEFI, and Secure Boot for the former; capture the stop code and investigate drivers and hardware for the latter.
Can outdated BIOS cause VALORANT crashes?
It can contribute to compatibility or stability problems, especially after a hardware or Windows change. Update only for the exact model, with stable power and BitLocker recovery information available.
What if other games also crash?
Treat it as a general system-stability problem first. Test RAM, remove overclocks, inspect GPU and chipset drivers, check thermals and power, and review storage and WHEA errors.
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