No, I mean I bought the OEM version from Newegg. From what I understand the OEM version can only be activated on a single motherboard without paying to renew the license.
Not really, you should be able to re-use it. You also may get away with dropping the old drive in the new PC and just having to load new drivers. You may have to re-activate it and might have to call in to MS, but if you do, just tell them you had to reload because of a system error.