You put 50+ hours into a file for class and you didn't make other copies? Well anyways your CPU is definatly fried, i bet your mobo is fried (btw is your or your GF's comp on a new UPS/surge protector? (less than 3/y old)) And i bet your PSU is fried as well. Find those CC's, good thing new egg has fast shipping 😛!
Try and see if a buddy will let you put your HD in his machine and burn your file to CD or something.