If your XP VM wasn't Bootcamp based, locate the .pvm file (by default in /Users/<username>/Documents/Parallels) and use the XP VM on the other computer in Parallels (you can copy it to your other computer if you prefer), or you can connect the the virtual disk of the XP VM to the Windows 7 VM, all you need to do is add the .hdd file inside the .pvm as a second disk in the Windows 7 VM.
Kathleen R, it's always good advice to backup, but, I'm sorry to say this, and don't get me wrong, people don't want/need to hear what they could of should've done unless you also have provide some solution to the problem they are having currently.
Last edited: Nov 25, 2013