|"ATI Radeon Graphics Processor AGP (0x4150)"|
I believe that's a Radeon 9600? It was a good card in it's day. I assume the problem is artifacts on the screen during gaming? It could be the card is overheating. Make sure the fan is working & that no dust is clogging the heatsink & fan blades. You could also try updating the drivers, but obviously that won't fix a hardware problem.
I recommend downloading & installing "option 2":