I have never had this problem before, nor have I had this game. The only help I could give you is to reinstall the game and extract the exe etc THEN (I think this could be your problem) make sure you DON'T repack the weapon text into the original directory make sure you repack it as a separate cbf file then click-drag into your vietcong folder. Sorry that may be incorrect but thats the only thing I can help you with.