Question about error

[Blaze]

I have small problem. I always could log 3acc normally but from today I can't and that kind of error is "visiting " my screen

2011.6.9 21:11:30
OS : Windows Vista 6.1 (Build: 7601)
CPU : GenuineIntel  Intel(R) Core(TM) i5 CPU         750  @ 2.67GHz @ 2667 MHz 4095MB RAM
Video : NVIDIA GeForce GT 440  (6724)
PosCode : LS8(83) 150096:-56865:-2981 4/1 [865]

IDirect3DVertexBuffer9::Lock failed(80004005).

History: FD3DVertexStream::Cache <- FD3DRenderInterface::SetVertexStreams <- Render Things <- ATerrainInfo::Render <- this=24_16.TerrainInfo0 <- RenderTerrain <- RenderLevel <- FLevelSceneNode::Render <- FPlayerSceneNode::Render <- SceneNodeRender <- Draw <- UGameEngine::Draw <- UWindowsViewport::Repaint <- UWindowsClient::Tick <- ClientTick <- UGameEngine::Tick <- UpdateWorld <- MainLoop

Maybe anyone know what shoudl  I do to play normaly ?
I'll be glad for all answers which will help