You're supposed to buy a new OEM Win7 license if you change your MB. Once the new board is installed, the change will be detected and you'll be asked to re-validate windows. You might be able to use your existing key, possibly with a call to support for activation.
If you do a clean install of Windows, I think the board change would still be detected as your hardware configuration is supposedly sent to M$ during your first activation.
I haven't found any straight answers on what happens if you try this so I say give it a shot and tell us what happens.![]()
It will not activate online. You will have to phone MS to activate by talking to a human. What happens depends on the mood the support guy is in.
What has happened to 1 guy I know is that the guy simply said, "No. We can't activate it. An OEM copy is permanently tied to the motherboard. Have a nice day."
However, I've also heard that if you call and say, "Hi. This is Bob Doe from BD computers. I'm replacing a motherboard under warranty for a customer. Would you be able to reactivate the OEM copy of Windows for the new motherboard?", the answer tends to be "yes".