User profile admin

I am try to help my friend with her computer. I know some about computers. Her problem Is that the other day she went to sign on to her computer and the computer would not let her In. It was just her user profile. She has a admin account and I have a admin account. I was able to logIn but she wasn't. I tried to change her password and that didn't work still would not let her In I got It fixed by doing a system restore. I just want to know what I can do to fix this? This Is the second time this happend to her computer. I don't live with her I remote Into her computer to fix problems. She have windows 7 64 bit.

This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.