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Every time i start this game up now its windowed and when i go full screen i get

LockRect failed: D3DERR_DEVICELOST

History: UD3DRenderDevice::ReadPixels <- UD3DRenderDevice::Present <- UGameEngine::Draw <- UGameEngine::Draw <- UWindowsViewport::Repaint <- UWindowsClient::Tick <- ClientTick <- UGameEngine::Tick <- UpdateWorld <- MainLoop

its strange i use to be able to get it fullscreen.
Switch your render in your postal2.ini in the system folder to OpenGL




You will lose character shadows but it should stop crashing.