I'm running more tests, might even try another HDD with a fresh OS install before swapping mobos.
BTW, mine's a Via based chipset (not nVidia) so I'll look here too:
http://msihq.designlab.info/board.php?boardid=24
.... and yes, installed the latest Via 4 in 1 drivers BEFORE video, onboard sound and ethernet drivers.
Seems like my problems began when I upgraded video drivers to either Cat 4.9s or 5.1s (ATI Radeon 9800 GT Pro 256) in order to get Doom3 running as it wouldn't run on the v 3.4 drivers that came on the cd-rom with the videocard. HL2 would play fine with those old drivers. After upgrading to newer drivers, HL2 and Doom 3 won't play for more than 5 minutes yet other games will. The same videocard with cat 4.9 drivers ran perfectly in my old system so I know the card's still OK. I can use a restore point prior to installing the newer drivers BUT that doesn't solve the problem as to why I can't use the newer drivers.
I've heard where some have problems with XP SP2 vs SP1. Anyone here have opinions on that?
It's now not just games either, it'll crash doing Turbotax and other (not demanding) times when not gaming. Games put alot of demand on any system.
Have also tryed another PSU, now an Antec Truepower 430W vs a cheaper brand 550W. Not heat related as I've tryed this with a house fan blowing on high directly at the mobo, cpu side (cover's off).
As for mobos, has anyone had problems with the ASUS A8N Deluxe?