Though I do not condone you spying on your girlfriend...here is a good keylogger.

I wish some people would have a brain, why explicitly SAY "I want to spy on my gf", and not say that it's for security purposes...at least then you won't get flamed.

nevertheless, keyloggers are good when you live in residence....that you know who's doing what on your computer when you aren't there.

HookDump

It loads on startup and runs in the background....and dumps everything into a desgnated file