Do you need to re-install Windows after replacing the CPU?

I am getting a free Core 2 Quad Q8200 from a friend which should arrive in a couple of days      

Now, I know that this is compatible with my motherboard, but I am wondering if I will have to re-install Windows 7 (Ultimate 64-bit, not sure if it's in my signature) after swapping processors. I've heard mixed opinions on this; I was under the impression that a Windows install was tied to the motherboard and CPU, and you would need to re-install Windows after replacing either in order for it to boot.

A quick Google search, however, seemed to show that I might in fact be wrong. Most people seemed under the impression that you should just be able to swap out the CPUs and the biggest issue you would face is possibly having to call Microsoft and ask them to re-activate.

Does anyone know for sure what the answer is?

Thanks