I try running Jk2 Radiant windows gives me a message a moment later, "Radiant MFC Application has encountered a problem and needs to close. We are sorry for the inconvenience" WTF?

Anybody know what might be going on?
I'm running Windows Xp Pro with
P4 1.5ghz
256megs Rambus
Geforce 3 Ti 200 (visiontek) 2832 drivers
Soundblaster Live
Any help would be great, thanks!