Just in case anyone is actually trying this under BootCamp (Yeah, off topic, but trying to be helpful ;) )
on my iMac, with fully patched Win 7, both the Benchmark and the game itself failed to launch. This was because of some missing video driver files. After going to the manufactuer's website (mine is an ATI Mobility 2600), I installed the full driver set and everything is working without issue.
(well, not "without issue" it's taking FOREVER to patch!)