Sometimes it ins necessary to change the product key from Windows 2008 R2. To do that this is quite simple

Run the following commands (from a CMD [Run as Administrator]):

1.) This parameter clears KMS entry:

Slmgr.vbs /ckms


2.) This parameter removes product key installed:

Slmgr.vbs /upk

3.) This parameter sets the new key:

slmgr.vbs /ipk xxxx-xxxx-xxxx-xxxx

 

Once changed, you need to activate Windows 2008 again via the System Panel!

 

Cross reference:

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