Hey, I am trying to install Windows 7 using Parallels 7. I have a window 7 64 bit Disk that is an upgrade disk from xp pro. I have installed xp pro as a virtual machine no problem, but when i try running the windows 7 64 bit upgrade disk through win xp, i get an error message that goes something like: This installation disk isn't compatible with your version of windows. to upgrade you need dthe correct installation disk. for more information, check your computers system information. " is it because it is a 64 bit disk? this was no problem with my bootcamp installation, which i later ran through parallels.. How to install from my Windows 7 64bit upgrade disk a virtual machine? thanks, R.