What happens when you don't activate your copy of windows within the allotted time? You get locked out--not any longer! This is how to login to an expired windows account.
I came across this through Digg as I had recently been asked about this through allexeperts.com and didn't have an answer, especially since the person did have a legit copy of windows but had not activated it as this blog states how to get around this and get your system up and running at least far enough to access your personal files.