A friend of mine had this same problem with his computer, he had to use a restore point because his registry was edited by a free AV and it somehow inhibited keyboard and mouse functioning.
Yeah, safe mode without any USB didn't make a difference. It was running XP and the Installation Disk was lost years ago. Can't use a restore point since I can't log in. And the popup that occurs is Windows telling me that something went wrong and it was asking for activation or something like that. In all honesty, I probably will just stick with the linux. All she uses is facebook and email anyways.
This is perhaps the last ditch effort you could do if none of those are working. This probably won't work as well but it's worth a shot.
You will need a technician computer on the same network as the broken computer (this computer must be Windows XP or higher). You will also need to know either the name of the broken computer (set in Windows itself) or its IP address when turned on.
1. Turn the other computer on. Ensure it is connected to the same network as the computer you will use in step 2 (use a wired connection to ensure this).
2. If you do not know the computer name of the broken computer, open your router's admin panel on the technician computer and get the IP address to it.
3. Once you have the IP address or the name, open command prompt and type this command: mstsc /v:xxx.xxx.xxx.xxx /console
Where the x's are the broken computer's IP address or it's name.
This will open a remote desktop session with your computer and you'll be allowed to use the keyboard and mouse on the technician computer to operate the broken computer.
--------------------------------------------------------------------------- Your bitterness, I will dispel