Ok so I have a Gateway 1624 and Ive had it since Aug 08'. It would get really hot and cut off all the time. At first I thought it was because I had way too much stuff on it, so I changed the hard drive, doubled my gigs, and I got a fun to go underneath it. Now it gets hotter faster and it cuts off every 5 or so minutes. I able to successfully get Windows XP installed but it's extreamly slow and unfortunatly not an authinticated version. I was told it could be the memory, the mother-board, the rams, or the fan being burnt out, ect. I go to college for photography and I desperatly need my computer and my photoshop, A.S.A.P. Finals are comming up and I need my computer to do them. Im not to keen on computers so can some one more knowledgable help me out? Thanks!

(And I bought it from Circut City so thats the reason I havent done anything about the warrenty)