New
#1
Upgraded Serial Number
Hello. I upgraded into windows 7 from one of my computers at home. I need to know which serial number I upgraded from because I [EDIT: NEED TO] reformat and now I need to go through the process of installing the old operating system, then doing a clean install of win7 while the old operating system is installed and registered. So is there any registry trick or stored file somewhere that I can retrieve which of my old windows numbers I upgraded from?
Rant: This process is somewhat frustrating