939 motherboard

I have an old ecs-a939 motherboard that I think is acting up. Most of the time USB devices will not work and i have reinstalled windows xp plenty of times and tried all the available bios's. Also during games after about 20 mins in they usually freeze up for about 10 seconds and then continue on like nothing happened and continue doing that bout every 5 mins. Sometimes the games even start to artifact. I have even tried 2 different video cards. I have tried upgrading my power supply but there is no difference. I found that if i put the /onecpu command at startup that is tends to crash less but it still crashes.

Specs:
Ecs-a939
AMD dual core 3800+
Evga 8800gts / Evga 6800gs
2gb kingston ram
Antec 500Watt power supply

So my question is: Could it be my motherboard that is causing these problems and if so where can i buy a new one, other then ebay, that ships to canada?

 

Try the AMD Dual Core Optomizer here (third from the top) for the game performance issues: http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_13118,00.html
It won't help with the USB problem though.

 

Already have it but thanks for posting.