You can use any Pro CD as long as the serial you use has been used on the same computer before. Should work flawlessly.

If you are trying to use a serial previously used on another computer, you are going to have to call MS about it.

They have some thing where you can only change out so many parts of a computer before you have to re activate Windows, so they know your not scamming them.

I also have lots of the MS OS's as ISO's, let me know if you need one.