BleepingComputer.com: In Dire Need Of Help :(

Okay i rebuilt my computer and i got this major problem, everytime i try to play a game it will automatically reboot or come up with this.

UT2004 Build UT2004_Build_[2005-11-23_16.22]

OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD PentiumPro-class processor @ 2202 MHz with 1023MB RAM
Video: RADEON X800 PRO (6706)

General protection fault!

History: FActorSceneNode::Render <- UCanvas:rawActor <- UCanvas::execDrawActor <- (ONSGrenadeLauncher AS-UCMP2-Cruciatus.ONSGrenadeLauncher @ Function Engine.Weapon.RenderOverlays : 0455) <- UObject::ProcessEvent <- (HUD_Assault AS-UCMP2-Cruciatus.HUD_Assault, Function Engine.HUD.PostRender) <- FPlayerSceneNode::Render <- UGameEngine:raw <- UWindowsViewport::Repaint <- UWindowsClient::Tick <- ClientTick <- UGameEngine::Tick <- Level AS-UCMP2-Cruciatus <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 10910191 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free

Ive tried everything i can think of to fix the problem and nothing is working. that is from Unreal Tournament 2004 game.

Uninstall the game and clean the disk, make it very clean, maybe even use a CD buffer/scratch remover. Good luck, fixing those problems is tough.

Did you re-install the latest vid/aud card drivers, as well as ActiveX?
Does this happen with any other game, or all games?
Cheers,
John