Part of my problem is I can't even log in to Windows. When it boots up, the keyboard and touchpad won't do anything, so I can't even enter a password to try and log in.
If I boot from the System Repair disk, the keyboard and touchpad work, so I know it's not a hardware problem. All of my System Restore points are gone (I assume they got wiped during the Win 10 update?). System Repair says it can't find anything wrong. I can use a Command Prompt, so I could if necessary get to the Windows root folder. I'd rather not use the nuclear option and do a factory-default System Recovery.