I have exactly the same video card on my WORK PC. Runs Aero fine in the Vista Ultimate O/S.
A cpl weeks ago I repartitioned my HDD, and on the new E Drive, installed RC Windows 7.
When I first booted in to Windows 7, no Aero. Windows Update then automatically set off to see if there were any Updates available and downloaded driver WDDM NVIDIA 220.127.116.1187 (a 32MB download), set a restore point, installed, I rebooted and now no problem with Aero, all good.
I have not had a BSOD on this PC or my home PC which is running RC Windows 7 also, but with a different graphic card...
Try doing a search for available updates thru Windows Update...that's my suggestion anyway.