3D problem

[PreDatoR]

Just wondering what your guy's take is on this. It has me baffled and frankly pissed off to no end... about 6-8 weeks ago my comp started kicking me back to the desktop when trying to game. Now this wasn'thte normal kick back that would shut the game down. The game remains running i can click on it and it opens back up only to go right back to the desktop. Is doing the same thing just like if you hit alt - tab to hop back. Sys specs are below. I had the sys overclocked at 1.9 Gig thoguht it was the oc'n bumped it down to 1.83 was fine for a couple days then started acting up again dropped it to 1.75 166fsb all agp pci busses in spec. was fine for a couple days and started it back up again. I've tried both a 8500 and 9000 and every drive i can find and still does it so i don't believe its a problem with the radeon's. I've tried 5 different sets of via 4in1's thinking it was a agp problem. Still does it. If it was doing this in just 1 or 2 games i wouldn't worry but it does them to all no matter if its running OpenGL or D3D. Sometimes a reboot will help it other times a reboot don't help. Last night i fianlly got pissed and reloaded WinXP Pro on it. Only to get all of the drivers loaded and have it do the same exact thing. I don't know what else it could be other than something hardware wise. Just wondering if anyone has experienced anything like this and how they remedied the situation. I'd really like to be able to play NFSHP2 or MoH;AA Spearhead without gettin' the boot all the time.

Sys Specs
AMD XP 1600+ AROIA Y does 1.9 Gig without breaking a sweat
Epox 8k3a+
2 x 256 Samsung PC2700 have had it as high as 218FSB light mem timings runs 200 rock solid at cas 233
Radeon 8500 or 9000
Herc GTXP
Linksys NIC
Lite on 24x10x40 cdrw
lite on 16x48 dvd
WD SE 120 Gig drive

[p3rsian]

i had the same problem after i installed SP1, but mine was from my nvidia card. i had a software called nvrefresh tool. so when i updated it to v 2.0 it worked.
but i beilive you have a ati, do u have any monitor refresh tool softwares running ?
if do uninstall it and try to see what happens

[PreDatoR]

no refresh tools running at all... i formatted cause i had used the same XP install and swapped out 6 motherboards. Did the repair thing every time but it figured there was some garbage in there messing it up so i formatted last night. i'm stumped running right now with the bare neccesity's until i figure it out. I have sp1 installed this time around. Before i didn't have it installed so i don't think sp1 could be causing it.