I'm aware of many threads on this issue, I read many of them over here and on Steam forums, but really nothing helped, I can't play my game it's just crashing at start 
I changed KillingFloor.ini in many ways posted here and there, delete it, delete whole catalogs (System and Maps) re upload game/catalogs from different locations on Steam, try to start the game as an administrator or with WinXP compatibility, nothing helped.
Through changes many errors appeared, right now it is
I've got Win 7 64bit, T4200/4GB ram/GT120M
I changed KillingFloor.ini in many ways posted here and there, delete it, delete whole catalogs (System and Maps) re upload game/catalogs from different locations on Steam, try to start the game as an administrator or with WinXP compatibility, nothing helped.
Through changes many errors appeared, right now it is
Build UT2004_Build_[2004-11-11_10.48]
OS: Windows NT 6.1 (Build: 7600)
CPU: GenuineIntel PentiumPro-class processor @ 2000 MHz with 4095MB RAM
Video: NVIDIA GeForce GT 120M (8026)
Could not spawn a GUI Controller!
Historia: UGameEngine::Init <- InitEngine <- FMallocWindows::Free <- FMallocWindows::Free
I've got Win 7 64bit, T4200/4GB ram/GT120M