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http://forums.tripwireinteractive.com/showthread.php?t=72709
So you can either verify your killing floor game cache, or uninstall and reinstall the game again!
If you have tried fixes, please list them. Its frustrating to offer help then have someone say they tried that already. Save us both time and tell what you tried, in what order and what happened with detail.
Steps on how to delete your system folder in the guide below
http://steamcommunity.com/sharedfiles/filedetails/?id=125107851