I have tested Windows 7 since 70xx(I think it was 7022), and now I have installed HomePremium of RTM, without activation, and hope that enougth time to got my serial Octobre 22, to activate it legaly.
here a little "WARNING" to be sure to my Windows 7 work until I get my licences, I tryed the Frankenstein trick, and other "cracks", but everytime, yes it activted my Windows, but othes thing like Windows Media Centre sopped working..... Windows did take much longer to boot..... A lot of stuff that is not so buggy if you keep a clean install.
Please do NOT crack Windows, this Work of Microsoft is to good, to be stolen.