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Possible Duplicate:
Clean Install Using Windows 7 RTM Upgrade

Is it possible to install the much cheaper Windows 7 upgrade version on a clean disk? What information will I need?

1) Will the Windows 7 installer ask me for my XP license key? or 2) Will the Windows 7 installer only run if it can detect an existing XP installation?

Furthermore, what will happen if my disk crashes and I need to reinstall in the future? Will I need my XP license key again?

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closed as exact duplicate by studiohack♦ Mar 25 '11 at 22:03

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

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I haven't tested this but it looks like it can be done:

But whether this won't be blocked by MS at some later stage is a whole another deal.

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