Originally Posted by AMD_man
You usually need to re install Windows when changing chipsets. If I'm not wrong, you also have to get a new activation code. I'm not sure about the last one though.
This is correct!
The Windows activation service checks hardware configuration and uses a point system to determine if the hardware has changed so much, a new key is required. I can't find the page anymore that lists each product and it's weight, but swapping a motherboard exceeds the limit.
To get it over properly (besides getting the key); you can put the drive in the original PC it came from and boot up. Uninstall any AntiVirus software and disable Windows Defender if used, then reboot. THIS IS VERY IMPORTANT. Failure to uninstall third party security software will make this process ruin your Windows install, often beyond recoverable.
Next, go to C:\Windows\system32\sysprep\ and run sysprep.exe (Right click > run as Administrator)
Make the following selections and do not interrupt until it is finished.
Once it shuts down, then move it to the new PC.
Edit: If you're moving the drive to another computer that had Windows 7 on it, you can use the key from that PC. The sysprep process removes all activation and will ask for a new key. Once it boots though, all your programs, configs are still there.
Edit2: And when you boot up and create a user, make the new username "temp".
Reboot login using your previous username and delete the temp profile.