I'm sorry I was not clear that you cannot start Windows.
Is it stable in Safe Mode with Networking? Try these methods to see: https://www.digitalcitizen.life/4-ways-boot-saf...
If so complete the steps I gave earlier.
If not then 1) Try whichever method works here to get into Advanced Startup Options to run System Restore if this is a Windows Update, or Go Back to Old Version if this is a version update. https://www.tenforums.com/tutorials/2294-advanc...
If you are able to access System Restore or Go Back and it fails, skip to step 3.
- If necessary create bootable installation media to access the repair options if not accessible by any other method: http://windows.microsoft.com/en-us/windows-10/m...
Boot media by powering up the PC while pressing the BIOS Boot Menu Key: https://www.sysnative.com/forums/hardware-tutor...
You may need to enter BIOS/UEFI Setup to turn off Fast Boot if it won't allow the Boot Menu key to interrupt starting Windows: https://www.mydigitallife.net/comprehensive-lis...
Choose UEFI version of media if offered, browse to second screen to Repair Your Computer link, then Advanced Troubleshoot options - to run System Restore to a point before the problem began.
- If this fails try a Startup Repair, or go back to Troubleshoot Options on the previous screen to Reset your PC which will save your files while reinstalling Windows.
- If that fails you can use the booted media to do the Clean Install. This link compiles the best possible install of Windows 10 that will stay that way as long as you stick with the tools and methods given. http://answers.microsoft.com/en-us/windows/wiki...
- You can also run the PC's Factory Recovery from it's hotkey at boot, following the procdure for that model found in it's Manual on it's Support Downloads webpage, or by asking Google how to Factory Recovery the exact make and model.
Feel free to ask back any questions and let us know how it goes. I'll keep working with you until it's resolved.