It's a failed win32k.sys , restart is stuck at 100

Hi geemeth perera,

Welcome to Microsoft Q&A!

Thanks for sharing the details and the screenshot. I understand how alarming it is to wake up and find your laptop stuck at 100% with a system crash, especially after leaving it on overnight for a download. This error typically points to a corrupted system file or driver, as well as a faulty update. Here's something you should do to fix the issue (follow step by step):

1. Force shutdown the laptop by holding power button > turn the laptop on
2. Force shutdown again once you see the laptop manufacturer's logo
3. Repeat the steps above a few times to trigger Windows RE
4. Often on the fourth time > Automatic Repair blue screen appears
5. Choose an option > Troubleshoot > Advanced options > then try the following in order:

A - Use the built-in troubleshooter:

• Click Startup Repair > wait for it to finish
• Reboot your laptop to see if the issue persists.

B - Boot into Safe Mode (if option A failed):

• In Advanced Options > Click Startup Settings > Restart > Safe Mode (F4)
• If you can boot into Safe Mode:
  • Open Device Manager > check for any warning icons.
  • Uninstall any recently added software, updates or drivers that may have triggered the crash (opening Settings, check Apps and Windows Update > Update History)
  • Run a clean boot to diagnose the conflict: How to perform a clean boot in Windows

C - Run diagnostics and file checker:

• In Advanced Options > Click Command Prompt > Enter the following:
  • sfc /scannow
  • DISM /Online /Cleanup-Image /RestoreHealth
• If nothing found, run sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows

D - Restore your PC back to a point when it was working (if available):

• In Advanced Options > Click System Restore
• Choose a restore point before the crash occurs (e.g. yesterday)

If you cannot fix the system and need to recover your files, you may have to click reset your PC. There's a Keep my files option which will help you reinstall Windows while still preserving your personal files in a folder on the C:\ drive. This is not a perfect guarantee, so it should be a last resort.

If this reply is helpful, please click "Accept Answer" and kindly upvote it to assist others who might face similar problem. If the issue persists or you have extra questions, please click "Comment" instead.

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