Alright, alright, here's some stuff you should know
1) remove all chipset, SATA and other motherboard related drivers
2) DO NOT RUN SYSPREP!
3) you should be able to boot, and it will ask you to reactivate. the key you got from the key finder is generic, it will not activate on the wrong motherboard. What you should do though is use your Windows 7 key when it asks you to activate.
4) Install all drivers and make sure that there are no Unknown devices in devmgmt.msc (just type that into the start menu)