Upgraded motherboard, switching from home premium oem to professional retail.

I have a retail copy of windows 7 professional that was activated on another computer which I am dismantling and no longer going to use. Can I use that copy of windows in my new computer that is running windows 7 home premium oem (just installed new motherboard

and it keeps asking for activation) without any problems? If possible am I going to have to do a clean install or can I use anytime upgrade?

I am going to give my younger brother my old computer which he should be able to have rights to the oem license, is that assumption correct? From what I've read in the other questions and answers the oem cd key is locked to the computer and since I will

be giving him most of the original computer (minus the memory and hard drive) this should work right?

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