Shivering Isles Crash!

I install Oblivion, and the thing works B-E-A-utifully. I install the Shivering Isles, and it crashes every about 8 minutes or so. Anyone else out there with the same issues?? Anyone know anyway to either fix the issue, or to be able to run oblivion in, say, an XP environment inside vista. I'm too lazy to dual boot whenever i want to play, and in a virtual machine graphics cards are pretty much driverless. Anyone got any ideas on how to enjoy the damn game? thanks in advance.

MB: ASUS Crosshair
CPU: AMD Athlon 6000+ X2
GPU: XFX GeForce 8600 GT XXX
RAM: 2GB DDR2-6400 OCZ SLI-Ready Memory
OS: Vista Ultimate x64