Or in this case, a 4th? I've been wanting to test it out for some time now. And while the 4th drive already has 2000 installed, I want to be able to wipe that out and replace it with Vista. Thing is, I can choose that on the menu with the active drive, but Vista itself needs to reboot. When it does that, however, everything goes back to normal as if I've never installed it. I've even gone into the BIOS and set the designated drive as my default, and still nothing. HELP.