Does the keyboard work? Use the keyboard to login. It might start loading the drivers and allow it to start working, if not you should reinstall using the device manager or whatever in Windows. I'm in linux mindin my own data, smokin on that Arnold Schwarzenegger. All day, all night, half pipe. Got that tech for technical difficulties.
If the keyboard is scared as well, you can try to start in safemode as stated above. Press f8 before the windows logo on boot, and select safe mode with command prompt and tell me how far you can get. (You will still have to login)
[I am young money Carter's IT]