Windows 2008 R2 Activation

If key change is required on Windows 2008 R2, the following procedure from elevated command prompt will do the trick:

1. Open a command prompt and change working directory to System32 directory
2. Type in slmgr.vbs -ckms (this clears and KMS entry you may have)
3. Type slmgr.vbs -upk (this removes any product key installed)
4. Type slmgr.vbs -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx (where the x’s is the product key you wish to use)
5. Type slmgr.vbs -ato (this activates the server)