Hello and welcome to the forum. The first question that immediately comes to mind is, why? The two Operating Systems are very similar with Ultimate having just a few more features. Are you currently having an issue with your existing installation? How did you go about getting to your present situation? Upgrade? Clean install? If you have a Windows.OLD folder there is a method that Microsoft describes in this article here How to restore a Windows 7-based computer to a previous Windows installation by using the Windows.old folder Perhaps, if you could describe your current issues, problems or concerns we might be better able to suggest a remedy or alternatives. Regards Randy
well a someone gave me the product key then it was fine for a month then today it said it wasnt valid and i dont have the product key or any of that for my win 7 home premium because it came installed