Computee Can't get past ID screen.

Hello,
So a couple of days back I woke up and my computer was on the ID screen, where you get to choose which profile to go under. I click on amy of them and it looks like I'm about to get in but then it just sends me back to the ID screen. I've unplugged it, gone into safemode and am now freaking out! It's Windows 7 and a Compaq computer, can anyone help?!