I'm wondering about the how the Windows 7 Anytime Upgrade from Home Basic to Professional works compared with a clean install of Pro. I read somewhere that when switching from Vista to 7, you could do the "upgrade" version, but it resulted in a slower OS than just doing a clean install of 7. Since this is just versions of the same OS, maybe that's not a problem here. It would certainly be easier to spend 10 minutes rather than doing a complete install! Does anyone have any knowledge about the efficiency of the Anytime Upgrade for Windows 7?