I two copies of WinXP - the Home version that came on my Dell desktop & an OEM WinXP Pro I replaced it with. Therefore, both of these versions of XP have been activated with my Dell.
I have a new intel-based Mac 7 on which I'd like to install Windows 7. (I have installed a program called Parallels that allows you to run Windows on this Mac).
When I install Windows 7 on my new Mac, can I use either of my WinXP versions if the installer asks for a previous version's Product Key? How does the upgrade version know if you have an earlier Windows version?