I don't understand the question.
The current word is that to use the retail upgrade license of Win7, a qualifying OS (XP or Vista) must be installed and activated on the machine. A factory pre-installed version of Vista qualifies. You have the option of doing an upgrade-in-place of Vista, or a "custom" (clean) install. The only problem I know of with the custom install is that the old installation is moved into a windows.old folder. That's not a problem if you have enough hard disk space to contain the Win7 installation plus all the old stuff. (You can use the Windows disk cleanup utility to get rid of windows.old later, if you wish.)
The "family pack" is three Win7 Home Premium retail upgrade licenses (keys) sold at a discount, I believe.
(You only get one set of install disks. I suggest making backup copies of them immediately. They aren't copy protected, if they are like every othe MS OS install disk I've seen.)
Your post reads like you wish to upgrade three machines, total. It sounds like you plan to use the Family Pack as Microsoft intended.
