since yours is a retail copy, u can reinstall win7.
iirc when u installed your system with the cd key, microsoft pegs your cd key to a "somewhat" unique system id based on the combination of your hardware ids (heard its hdd, cpu, mobo, ram).
of course if u have 2 identical systems, the id is not that "unique" afterall. can't dwell further into this.
so, when u change mobo, most prob during reinstallation, the cd key will be invalid. because microsoft has already pegged that cd key to your old system id (when u change mobo, your system id is changed). in this case, you can ring microsoft up and tell them the issue, they'll reset it for you.
(not really sure if they can check the individual component id to validate your claim that you only change mobo or not. afterall they generate the system id based on a certain algorithm and should be able to reverse engineer. but i guess they are not that free either)
i have done this a couple of times when i decided to upgrade my ram and hdd at separate instances.
usually oem license is pegged strictly to mobo only. u can upgrade the parts without having to call microsoft up to reset.
and retail license is pegged to a combination of system hardware ids. can't remember which hardware are included, but i vaguely recall primary hdd, cpu, mobo and ram being part of the equation.
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