I'm having the same problem on my Quicksilver 733. The weird thing is that I've played the game through twice before without any problem. I was working my way through again, and now that I'm at the forrest level, I can't get it to load without crashing. One thing that has occured to me: I don't have the RTCW disk in the drive right now (recently moved and still have my software packed away). Have you guys tried loading the level with the CD in the drive? Just a thought.
--Ldog