Actually, I rolled back my video drivers to 4.12 as I installed 5.4 and 5.3 after a fresh format and install of winXP just to find out I was getting about 40 fps in CSS stress test as opposed to my usual 93. I rolled back to 4.12 and voila! I'm afraid to upgrade to 5.4 again, as it seems there's an issue with anything above 5.2 for me (I have no clue why!).
My specs:
p4 3.0E
Asus p4p800-SE mobo
1 gig Dual Channel ram (mushkin) 2.5-3-3-7 I thnk
Radeon 9800 Pro 128
Soundblaster Audigy 2 (is it me or does Creative have driver issues?)
I'm not oveclocked and my mobo reads the CPU temp at around 44C.
Like I said though, I played for extended periods of time with no problems at all. I play HL2 DM for hours and never have issues (much more demanding game). Also, it only happens every once in a while, so right after I get that message, it doesn't happen if I open Guild Wars again.
If I recall, it gave me that message while using 5.4 drivers as well.
Link:
http://www.guildwars.com/support/hardware-failure.html
Thanks.