When you do an upgrade you get the key which unlocks the professional version (NO MATTER which version of windows you get, you really end up with Windows 7 Professional and Windows 7 Ultimate of one of two 32bit or 64bit). if you get Windows 7 home premium you really have Windows 7 Professional and Windows 7 ultimate it's on all the versions disk's and gets installed, but only Windows 7 Home Premium gets installed with that key, if you want Ultimate, buy the key online and change product keys which unlocks Ultimate. So now how long since you up graded? can you do a system restore to before you unlocked Professional? or otherwise you can only Burn and start again, losing everything. But you can just change hard disks and reativate on the other computers.