How to change your License key with Windows Server 2003 R2

1. search system32 for wpa.* rename both files, then run the %systemroot%\system32\oobe\msoobe.exe /a
2. Click Yes, I want to telephone a customer service representative to activate Windows, and then click Next.
3. Click Change Product key.
   10. Type the new product key (I would use the new R2 key) in the New key boxes, and then click Update. When you get to the previous window, close product activation.