KF Error on start-up

Everytime I try to start Killing Floor I always get a message that says:



Runtime Error!



Program:

Program Files\Steam\steamapps\common\KillingFloor\System\K illingFloor.exe





This application has requested the Runtime to terminate it in an unusual way.

Please contact the applications support team for more information.



or it will come up with this:



Build UT2004_Build_[2004-11-11_10.48]



OS: Windows NT 6.2 (Build: 9200)

CPU: GenuineIntel PentiumPro-class processor @ 1699 MHz with 3959MB RAM

Video: Intel(R) HD Graphics (2849)



Error setting display mode: No acceptable display modes found (D3D_OK). Please delete your KillingFloor.ini file if this error prevents you from starting the game.



History: UD3D9RenderDevice::UnSetRes <- FindBestMatchingMode <- UD3D9RenderDevice::SetRes <- UWindowsViewport::TryRenderDevice <- UWindowsViewport::OpenWindow <- UGameEngine::Init <- InitEngine <- FMallocWindows::Free <- FMallocWindows::Free



What do I do?