I would just work on selling that computer at pawn shop or craigslist. use that money plus whatever you had in store for a new card, and buy a new system. A VERY low end gaming system would be better than what you have. I have a gateway FX that is a couple of years newer than yours, and Ive run into so many problems upgrading it. I had to get a new power supply, because ANY system bought off of sellers like gateway,dell, etc. will have very crappy power supplies. I upgraded to a 7870 card which should have been decent, but it has given me nothing but problems, and i believe the problem to lie within the motherboard and processor.