David Chartier from TUAW has found that on his iMac, he has had no success of installing Release Candidate 2 of Windows Vista. Even with the new Boot Camp 1.1.1 update, which was supposed to offer compatibility with the new iMacs, the installation fails. Windows Vista reports that it doesn’t like the drive Boot Camp creates, thus it doesn’t even format it. Other users have also reported this, but some say it works fine for them.
“Judging by what’s being said I would say that despite the updates, Vista will not work on Core 2 Duos, perhaps cause they’re 64bit?” – TUAW Commenter AeronPrometheus
David said that he downloaded the 64-bit version, which doesn’t work. However others suggest that using the 32-bit version may work. We’ll have to see if Apple says anything about it.