I just upgraded to Windows 7 64-bit from Vista 32-bit. I had Vista on hard drive A, however I installed W7 on hard drive B since I would have to do a clean install anyway. Now, when I change my boot priority to drive B it tells me to "Reboot and change boot priority or insert CD/DVD media to boot from." So basically, right now my boot priority is my old drive with Vista and every time my computer starts up it asks me if I wish to launch W7 or Vista. Why can't I change my boot drive to be drive B?