I had bought Quake 4 DVD SE yesterday, and the game runs like a dream. I love every moment of it. I have no problem with performance whatsoever...however, that is until I get to the end of leve 4 (I believe) when you have to board the Hannibal. Once I get on the elevator, and when the next level starts to load, the game crashes to desktop. I have the most updated mobo drivers, graphics drivers and sound card drivers (even the Open AL fix for Audigy 2) and STILL it crashes. I am at a loss as to what to do

My specs:
Asus A8N SLI-Deluxe
AMD Athlon 64 3500+
2GB PC3200 Corsair XMS RAM
ATI Radeon X800XL 256MB
SB Audigy 2 ZS Plantinum
250GB Maxtor SATA HD