Since you already have a license, can you accept a copy of the media? My parents have an eMachine (some Athlon 64 special from Wal-Mart) with XP Home, and I'm *pretty* sure that they got install media ...
No it shouldn't matter. But you will have to give a call to MS (probably) to get them activated. Shouldn't be much of a problem. I've done it several times before.
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