UDK.exe has stopped working
After a few minutes of playing in any server the game crashes and I get the error that says UDK.exe has stopped working.
I’ve already tried deleting config folder and verifying Steam cache files but it didn’t work.
From your Launch.log it looks like you went back to the main menu from playing the game and it crashed while loading the main menu. Hmm…
First things first. From your DxDiag.txt:
Driver Date/Size: 12/6/2011 14:16:00, 933888 bytes
Please update your video card driver.