Help ? No label crash

Im getting this error when everydetails are very high if i dont put all very high i dont get it any idea ?
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No Label

Crash Time: 10/29/11 19:05:47

OS: Windows NT 6.1 (Build: 7601)
CPU: AuthenticAMD Unknown processor @ 3214 MHz with 3069MB RAM
Video: NVIDIA GeForce GTX 460 (7533)

UserName: CASPER
ComputerName: CASPERCASPER
Application location: H:\Downloads\swat 4\Content\System\

SWAT Build Number: 31973

IDirect3DVertexBuffer9::Lock failed(88760870).

History: FD3DVertexStream::Cache <- FD3DRenderInterface::SetVertexStreams <- USkeletalMeshInstance::Render <- FDynamicActor::Render [Hands59] <- RenderSolidScenePass <- RenderSolidScenePasses <- RenderLevel <- FLevelSceneNode::Render <- FPlayerSceneNode::Render <- UGameEngine::Draw <- UWindowsViewport::Repaint <- UWindowsClient::Tick <- ClientTick <- UGameEngine::Tick <- UpdateWorld <- MainLoop->GenerateExtraCrashInfo [(GLevel: 'myLevel' PendingLevel: '(NULL)' NetMode: 'NM_Client'] <- MainLoop

Format PC...

I used to get always critical error last time when I format my PC and now I haven't any critical error on game after to format it

I have everything important in my pc and i have no problem with pc so i dont wanna format it only happens in swat 4 both versions(1.1,1.0) that all are in different folders.I play 10 mins maybe 1 hour after that in some position i get this error but i have no problem when i play swat 4 with low grapics.I still didnt get 'IDirect3DVertexBuffer9::Lock failed(88760870).' what this certainly means.

I restarted game like 30 times now i cant connect to any server in 1.1 but i can see server list any idea ? -.-

HAHAHAh
AuthenticAMD Unknown processor @ 3214 MHz with 3069MB RAM
ur pc doesn't even know ur processor !!!!

u know what, try to install direct X 11 (Even swat4 need just the 9th) , maybe some system files are missing!