Im getting a new PC that has no preset OS so I'm wondering if I can use the same product key from my old PC to activate another Windows on the new one. If not, would I have to delete the old one somehow to transfer it over? How do I do this if that is the case?
I think it depends on whether you bought the OS or whether it came on/with the computer. If on/with the computer, it will probably be OEM and not transferable. If you bought it separately, then if you deactivate it, you should be able to uninstall on old computer and install on new but you shouldn't have it installed on more than one computer at any one time.