A Stop Error message like Your PC ran into a problem that it couldn’t handle, and now it needs to restart, you can search for the error online SYSTEM THREAD EXCEPTION NOT HANDLED (pci.sys) usually means that a bad driver caused your Windows computer to crash. In this case it is pci.sys, but it could be files like athwb.sys, nvlddmkm.sys, win32k.sys, atikmdag.sys, aswsp.sys, etc.
We have already seen what you could do if yu receive a System_Thread_Exception_Not_Handled (nvlddmkm.sys) error. Now lets us see what to do in the case of pci.sys driver file. A similar exercise can be taken in the case of any other file.
SYSTEM THREAD EXCEPTION NOT HANDLED (pci.sys)
1] Now pci.sys is a driver file that is located in the C:\Windows\System32\drivers folder and it is a Microsoft operating system file related to NT Plug and Play Enumerator.
It is quite possible that this file could have been corrupted as a result of which you are are getting Blue Screens.
Search for instances of the pci.sys driver file in the System32 folder. You will see one in the location mentioned above and another possibly at C:\Windows\System32\DriverStore\FileRepository\ or C:\Windows\System32\DLLcache\. Check its Properties, version number and size. If it is identical, you could copy this file to the C:\Windows\System32\drivers and replace the original file. Check if this helps.
2] The other alternative would be to run System File Checker to identify and replace corrupt operating system files. Once the scan is completed, restart your computer.
4] Run the Windows 10 Blue Screen Troubleshooter from Microsoft.
5] If the Stop Error prevents Windows from booting, run Automatic Repair – that is one option that you may want to consider.
If that doesn’t help, read on.
6] If the Blue Screen occurs at startup, you may need to boot Windows 10 in Safe Mode and rename or delete the faulty driver. If the driver is used as part of the system startup process in Safe Mode, you must start the computer by using the Recovery Console to access the file. You could perform a Clean Boot and see if that helps you troubleshoot the Blue Screen.
This post will help you if you receive a Your PC ran into a problem and needs to restart error message.