when i play , it always quit to windows desktop ,i don't know why? something wrong with my PC? Plz help me email me thank u indeed

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Crash Time: 05/19/08 12:45:30

OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD PentiumPro- ****processor @ 1839 MHz with 1023MB RAM
Video: RADEON 9550 (6444)

UserName: user
ComputerName: SEVER
Application location: E:swat4ContentExpansionSystem

SWAT Build Number: 1.0

Access Violation caused General protection fault!

History: FD3DVertexStream::Cache < - FD3DRenderInterface::SetVertexStreams < - StaticMeshBatchRenderer::Render < - RenderStaticMeshBatchList < - FStaticMeshBatchList::Render < - RenderSolidScenePass < - RenderSolidScenePasses < - RenderLevel < - FLevelSceneNode::Render < - FPlayerSceneNode::Render < - PrecacheRenderData < - Precaching < - UGameEngine::Draw < - PaintProgress < - UObject::CallFunction [SCRIPT='GUI.GUIController.PaintProgress' OBJ='SwatGUIController0'] < - UObject::CallFunction [SCRIPT='SwatGui.SwatMission loadingMenu.OnProgress' OBJ='SwatMission loadingMenu'] < - UObject::ProcessEvent [Function SwatGame.SwatGUIControllerBase.SetProgress() on SwatGUIController Transient.SwatGUIController0] < - UGameEngine::SetProgress < - ClientInit < - UGameEngine::LoadMap < - LocalMapURL < - UGameEngine::Browse < - ClientTravel < - UGameEngine::Tick < - UpdateWorld < - MainLoop->GenerateExtraCrashInfo [(GLevel: 'myLevel' PendingLevel: '(NULL)' NetMode: 'NM_Standalone'] < - MainLoop