Without being too protective of myself. Liger, I will try to explain, you are FAQ. Can't you go check out the FAQ? If it isn't there, then maybe you should write one to suit your current dilema.
Oops, back to the jungle.
Seriuosly, the only thing I can think of, is someone has used your computer over the break as a learning tool, and stuffed something up. I know my computer has been used, I do not know yet to what degree, but I will find out on Monday.