I installed my old hard drive which came out of my Dell XPS600 which died. This was a replacement drive as the original that the XPS came with crashed. It has xp installed but obviously when I installed this drive in my custom build it will not activate. Problem is I do not have the product key and Dell and Microsoft, of course, cannot help me recover it. I want to upgrade to Windows 7 anyway. Is there any way to install Windows 7 on this drive without the product key for the old XP?