I'm running Vista in bootcamp on my Rev A iMac. For the most part, it runs well. I use it for playing games, and I was having some trouble with the sound "skipping" in Half-Life 2. According to their support forum, it looks like I should try enabling HPET. From http://support.steampowered.com/kb_article.php?ref=4911-EICN-7411: My question is... HOW do I access the BIOS in bootcamp... how do I enable HPET?