Exactly! This is because you cannot legally transfer OEM licenses to new computers (and an upgraded motherboard is considered a new computer). If your Windows install disk is “branded” with a computer maker’s brand name, or says OEM/System Builder, Upgrade, Academic Edition, or "For Distribution with a new PC only", then it is not transferable to a new PC (or upgraded motherboard) under any circumstances. These OEM licenses are inextricably tied to the "original equipment".This assumes the install was not made with an OEM version of Windows 7....