I have windows vista home premium and want to upgrade to windows 7 ultimate. Can i buy the windows 7 ultimate upgrade or do i need to buy windows vista ultimate and then buy windows 7 upgrade or do i have to buy windows 7 ultimate the one that doesn’t say upgrade on it?

I just want to know whats the cheapest and easiest way to do it.

I am planning to pre-order a Windows 7 Ultimate upgrade download. I wasn’t sure if I bought one product key if would work on more than one computer.

I have Windows Vista Home Premium on my computer right now. It was pre-loaded on the machine. I’d like to upgrade it to Windows 7. I am also planning on buying a Mac. Will I be able to load the Windows 7 upgrade version on that also? Thanks in advance for your help.