Same here, specs in dropdown. Total freeze, however audio still works (doesn't loop?). Everyone in this thread who has problems has an 8800 of some sort (inc. rebadges), I thought it could've been a G92 problem, but the 8800gts is a G80...
Occurs in RCT1 too, it didn't do it early on in the RC, since a few months back with the late RC/RTM it's started doing it. Windows or driver update perhaps?
Can't find any fix atm, I've got around all problems with the other games so far under Windows 7 (inc. Chaos Theory FTR), but I can't figure this one out.
For the record, it's not an x64 problem, either - my RC was x86 and still had issues.