No, you don't need! You can download the full Windows 7 SP1 MSDN (SP1 already integrated) using the link given above! But, I don't think the upgraded Windows 7 key will match an original Windows 7 SP1 Home Premium! Thanks to let us know. This is a win7 pro version. I don't thimk it will work with my home premium key but I will try. It is possible but if I do recall correctly the version you get is determined by the key anyway. all flavors of win7 are on the disk. I know that is the way Vista was setup. DLing both ver of it now. I can still manually slipstream if this doesn't work.