So today, I turn my machine on, which boots normally, and reaches the the blue screen which allows you to choose a profile. However, the Administrator profile, which I always use, is now gone. In fact, the screen displays NO profiles. It's simply a blue screen, nordered by a darker blue on the top and bottom, with a small window's xp logo a little to the right. Does anyone know what's going on here?
More aboutwindows display user profiles
Try running chkdsk with the /p switch on your bootdrive using the recovery console.