Miért lép ki a SWAT 4 Gold játékom kritikus hibával?

Játszom 2-3 órát aztán kilép ezzel a hiba üzenettel:

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Crash Time: 07/11/12 09:55:09

OS: Windows NT 6.1 (Build: 7601)

CPU: AuthenticAMD Unknown processor @ 1995 MHz with 3068MB RAM

Video: ATI Mobility Radeon HD 4530 Series (678)

UserName: Levente

ComputerName: LEVENTEPC

Application location: C:\Program Files (x86)\SWAT 4\ContentExpansion\System\

SWAT Build Number: 1.0

ReadFile failed: Count=0 BufferCount=428 Error=A művelet sikeresen befejeződött.

Előzmény: ULinkerLoad::Serialize <- FCompactIndex<< <- TArray<< <- TLazyArray::Load <- FStaticTexture::GetTextureData [HUD.officerviewport] <- FD3DTexture::Cache <- FD3DRenderInterface::CacheTexture <- FD3DRenderInterface::HandleCombinedMaterial <- FD3DRenderInterface::SetSimpleMaterial <- FD3DRenderInterface::SetMaterialSP [InMaterial='officerviewport' 0x9E3E540 InMaterial->Outer='HUD'] <- FCanvasUtil::Flush <- UCanvas::WrappedPrint [(KéK RENDőRTISZT 1 )] <- UCanvas::execDrawText [(ExternalViewportManager SP-Backstage.ExternalViewportManager13 @ Function SwatGame.ExternalViewportManager.DrawOfficerName : 0176)] <- UObject::CallFunction [SCRIPT='SwatGame.ExternalViewportManager.DrawOfficerName' OBJ='ExternalViewportManager13'] <- UObject::ProcessEvent [Function SwatGame.ExternalViewportManager.Render() on ExternalViewportManager SP-Backstage.ExternalViewportManager13] <- UObject::ProcessDelegate <- GUIMultiComponent::Draw <- GUIController::NativePostRender <- UInteractionMaster::MasterProcessPostRender <- FPlayerSceneNode::Render <- UGameEngine::Draw <- UWindowsViewport::Repaint <- UWindowsClient::Tick <- ClientTick <- UGameEngine::Tick <- UpdateWorld <- MainLoop->GenerateExtraCrashInfo [(GLevel: 'myLevel' PendingLevel: '(NULL)' NetMode: 'NM_Standalone'] <- MainLoop