Restart the computer
Unplug all external devices
Note the stop code and error message
Boot into Safe Mode
Undo recent software changes
Uninstall recent drivers
Update Windows
Update device drivers
Run Windows Memory Diagnostic
Run CHKDSK
Run SFC /scannow
Run DISM /Online /Cleanup-Image /RestoreHealth
Check for overheating
Test the hard drive or SSD
Scan for malware
Disable overclocking
Restore the system to a previous point
Perform a clean boot
Repair or reinstall Windows
Replace faulty hardware