If Windows began freezing, shutting down, or restarting after an update, first check whether it still reaches the desktop. Use Windows settings for a PC that starts; use Windows Recovery Environment (WinRE) if it cannot. A recent update may be involved, but timing alone does not prove the cause: hardware, drivers, and other software can also trigger crashes or unexpected restarts.
1. Check whether Windows starts and record any error
Note what happens before choosing a repair:
- Windows reaches the desktop: Continue with the checks in Settings and the other in-session steps below.
- Windows cannot start, or keeps returning to a restart loop: Use WinRE rather than repeatedly trying to sign in.
- A blue screen shows a stop code: Write down the code and any “What failed” module name. These clues can help narrow whether a hardware, driver, or software issue is involved.
- The PC powers off or freezes without an error: Record when it happens and any recent hardware or software changes. The symptom alone does not identify the cause.
For a PC that repeatedly fails to start, Windows may enter recovery after multiple unsuccessful starts. You can also reach recovery from Advanced startup in Settings when available, or by booting from Windows installation media. See Microsoft’s guide to Windows Recovery Environment.
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2. Try basic checks before changing or removing updates
If Windows is usable, begin with the less disruptive built-in checks. On Windows 11, Microsoft directs users to the Get Help app’s Windows Update troubleshooter. Review Update history as well, so you can identify what installed shortly before the symptoms began. Microsoft’s Windows Update troubleshooting guidance covers built-in troubleshooting and repair options for Windows 10 and 11.
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Check likely causes of unexpected restarts
- Disconnect newly added hardware and see whether the behavior changes.
- Try Safe Mode if the problem continues and Windows can be started in that mode.
- Open Device Manager and look for devices marked with an exclamation point.
- Check available space on the system drive. Microsoft suggests 10% to 15% free space as a general rule of thumb, not a fixed minimum; the amount needed varies by system configuration.
These checks can point to a driver, device, or storage issue rather than the update itself. Microsoft’s unexpected restart and stop-code guide explains these troubleshooting clues.
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3. Uninstall a recent update if the timing fits
If the symptoms began immediately after a particular update, removing that update is a targeted next step. First, back up important files if possible: Microsoft warns that some recovery options can cause data loss.
When Windows reaches the desktop
- Open Settings > Windows Update > Update history > Uninstall updates.
- Select the relevant recent update and choose Uninstall, if that option is available.
Labels can vary somewhat by Windows version. Microsoft notes that some updates cannot be uninstalled. Removing a security update can also remove protections it provided, so understand that trade-off before proceeding. Reinstall the update or apply a corrected update when an appropriate fix becomes available. Follow Microsoft’s update-uninstall instructions.
When Windows will not open
- Enter WinRE using an available recovery route.
- Select Troubleshoot > Advanced options > Uninstall Updates.
- Choose the relevant update and follow the on-screen options, if Windows offers removal.
4. Use Startup Repair for a failure to start
Startup Repair is intended for problems preventing Windows from starting, such as certain missing or damaged system files and boot-configuration errors. It is not a general repair for every freeze that happens after you have signed in.
- In WinRE, select Troubleshoot > Advanced options > Startup Repair.
- Select the Windows installation if prompted, then follow the instructions and allow the repair attempt to finish.
Startup Repair diagnoses and attempts to fix some startup problems, but it may not resolve every one. If the device is encrypted, you may need its BitLocker recovery key. See Microsoft’s Startup Repair guidance.
WinRE may open automatically after repeated failed starts. If Windows is still accessible, use Advanced startup from Settings; if built-in routes are unavailable, Windows installation media on a USB drive or DVD can boot to recovery. Microsoft documents these options in its WinRE guide. Do not treat repeated forced power-offs as the normal way to enter recovery.
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5. Repair Windows system files, then reassess
If Windows starts and you suspect damaged system files, run Microsoft’s repair commands in order. They address system-file corruption; running them does not establish that corruption caused the freeze or shutdown.
- Open Command Prompt as an administrator.
- Run
DISM.exe /Online /Cleanup-image /Restorehealthand wait for it to complete. - Then run
sfc /scannowand let verification reach 100%.
Microsoft recommends DISM before System File Checker (SFC): DISM can supply files needed for repairs, while SFC scans protected system files and replaces corrupted files from a cached copy. See Microsoft’s DISM and SFC instructions.
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Windows 10 support status
Microsoft ended support for Windows 10 on October 14, 2025. After that date, Microsoft no longer provides free Windows Update software updates, technical assistance, or security fixes for Windows 10. Your Windows version and support arrangement can affect what updates and next steps are available. Check Microsoft’s current update guidance and recovery guidance for details.
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