Just a note here Magic Jellybean Key finder will also pick up any Office Keys as well as well as the Windows Keys you can run it from a floppy or from any form of portable storage device USB Stick CD ROM or whatever it works quickly and very easily.
These Keys [b]Are Not[/b] on the install Cd's but on the actual computers and if you do not have a COA on each Box it is the fastest and easiest way of checking the keys and changing them if necessary.
As you haven't made any mention of the COA's I'm assuming that you have a Volume License copy of Windows installed and if that is the case most likely all the keys will be the same. At least they are whenever I buy Volume License copies of any MS products.
There is another possibility and that is that you have all Pirate Software installed but if you have a lot of units in one business I would be guessing that you have the Volume License stuff installed.
Col