Please help if you are able. I'm installing offline to a Dell Optiplex 790 with a genuine Win 7 Pro OEM license sticker. My installation media is the retail version of Win 7 converted to universal. During installation I entered the OEM key which seemed to be accepted. The computer boots and reports a build number of 7601 and that this copy of Windows isn't genuine. I would rather not use a loader. Is there a way to convert the retail version of Windows 7 Pro to OEM. Or maybe I need to search for a link to the OEM version.