Cannot launch Killing Floor (Quick reply please)

Everytime I try to launch Killing Floor, it says Critical Error, and says this.

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

OS: Windows NT 6.0 (Build: 6002)
CPU: AuthenticAMD Unknown processor @ 2699 MHz with 4095MB RAM
Video: ATI Radeon HD 3200 Graphics (630)

Could not spawn a GUI Controller!

History: UGameEngine::Init (and a bunch of other stuff that gamespot won't let me post because of that HTML crap)

Try to verify all of your files in steam, something maybe have gotten deleted.

Try to verify all of your files in steam, something maybe have gotten deleted.

Wasdie

... what he said ( or she, what do I know lol) .... that usually takes care of most problems; if it doesn't, you'll probably have to reinstall