Nevermind. I fixed it. I needed to install all the patches for the game.

Whenever I open radiant, I click open on codwaw.prj and open that, then it says QE_loading..... Bla bla bla. Something like that, but it never loads, the. Whenever I try opening a map or making a new one, radiant freezes. What do I do? I've reinstalled everything twice. That doesn't work please help...