Flashman

Hope someone can help me with my problem, ok here it goes :
The only problem I have is when playing a game (DAOC, Dark Age of Camelot), the card works great on all games but this, the problem occurs randomly, my system will lockup during gameplay. Doesnt happen while zoning just during regular play, usually on heavy loads of graphics.

What I have done: Updated the MB bios, latest drivers for video and audio, latest MB drivers for the AMD 761 chipset. Re-installed XP SP1 after a fresh fdisk and format. Tried tweaking all the possible settings in game and on the bios and ATI utilities. Currently im using the catalyst 3.0 drivers. I am d/l the omega drivers now to see if that fixes it. I also thought about modifying the voltage on my MB, but I am unsure how to do this at the moment, or even flashing the video card bios but I am not sure this would solve the issue.

Any tips would be greatly appreciated.

My system specs are:
AMD Palmino core 1.4gig
512M PC2100 Kingston RAM
ATI 8500
SB Audigy
PSU 350W
XP SP1