I hate to be the one that tells you but your in a tough spot. I wouldn't put two pennies into that system cause you can never upgrade it to anything really new. Cause in point it is an at motherboard. You might have usb but its probably not hooked up, and no agp slot. Your probably running edo ram. I would say scrape together 300 bucks for a duron cpu and mbo, with a geforce mx video card, and ram. You can use your old hard drive, sound card and modem. You can trust me on this I just upgraded a company with ten of those machines and it is beyond a freakin nightmare to adda a new proccesor to it, since there is no manual for the dip switchs or jumpers.