What brand are they?
In my experience, manufacturer OEM copies of windows are often built to recognize only OEM serials. I bet, however, that since those machines were sold downgraded to xp, you could get the set of OEM discs for windows 7 by calling the manufacturer and saying that you have a key for 7 on the side of the machine but it's not installed on it. Did it all the time with lenovo and HP, but I'm not sure if 7 is being dealt with differently in any way.
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