I just received my Dell upgrade dvd from vista ultimate to win 7 ultimate 32 bits. Poped in the dvd in a CLEAN-NO OPERATING SYSTEM hardrisk. Did a clean install; didnt put my serial during setup. After installation was done I entered my UPPGRADE serial found on the sticker dell sent on the dvd sleeve. I wasnt expected that serial to work since its only supposed to be upgrade serial but Boom it activated just fine. How about that!! Could it be that my BIOS has 2.1 in it?? I dont think so but I just got a free full vesion of ultimate Now if I can only switch it to 64bit.. Can I do that with the current CD or i need another 64bit version ?