Please make sure you are familiar with the forum rules. You can find them here: https://forums.tripwireinteractive.com/index.php?threads/forum-rules.2334636/
Single player or multiplayer? Have you tried changing the controls? Are you trying to use a keyboard or a joypad? Can you see enemies moving about (ie. are you sure it's not just that the game is freezing up)?
I would suggest you try deleting your user.ini file in your steam/steamapps/common/killingfloor/system directory (cog icon) which will reset your controls to default, and see if that fixes anything.
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