Diversion - That's what I suspected, and it can't be slipstreamed either, thanks MS.
I am going to try installing onto another partition, upgrading to SP1 and all updates, then cloning to another HD with ATI. Then delete the Home premium partition, booting from the ATI rescue disk and restoring the clone to a newly created C:\ partition to see if that works.
Apologies for the late replies.
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