I installed Microsoft Windows 7 Professional (64bit) from a Dell OEM disc on an older Dell system that was preinstalled with Windows XP. The activation will not work, which I presume is because the system was not originally licensed for Windows 7.
I have since purchased a retail copy of Windows 7 Professional for this system.
Can I avoid completely reinstalling Windows 7? I presume that the OEM installation will not take my Retail license key. My idea is to do a repair installation of Windows. I think I've done this before with Windows XP and it "converted" the installation from OEM to Retail without wiping/reloading.
Any thoughts how best to do this?