live ask live comments

i currently have windows 7 home premium, and im thinking of upgrading to windows 7 ultimate. could some one please tell me how i would be able to downgrade to windows 7 home premium if i am not satisfied with windows 7 ultimate?

I was wondering what is the difference between the Windows 7 RC (Release Candidate) and the Final version of Windows 7 RTM?
I had both Windows 7 RC and Windows 7 RTM and I see no difference, except the default windows wallpaper.