Windows Vista help?

My little sister called me at 3:20am in a panic. She was crying and I honestly thought someone had died (though why she'd call me first, I don't know). Turns out her computer locked her out of her profile and forced her into a temporary one. In typical college student fashion, she has a project due next Monday, and now she can't access her profile. Hence the panic. Goodness, my heart almost stopped!

So yeah, all you Windows Vista savvy folks, anyone know what to do? Basically, there's only one profile, which is her's (the administrator's). Windows won't load her profile, and instead takes her to a temporary one. I looked online for solutions, but it seems the problem lies with folks deleting one of multiple profiles, which screws up the registry. I don't see how my sister's problem is the same, since she only has one profile? Any clues?