This tutorial to show methods to change Windows Product Key and Windows Activation
GUI Mode
1. Open Run Dialog and enter 'slui 3'
2. Enter New Windows Key in Product Key textbox
Windows Server 2008/2008 R2
Windows Server 2012
3. Click on 'Next' or 'Activate' button to activate Windows License
Command Line Mode (Windows Server 2008/2008 R2/2012)
1. Open Command Prompt in Administrator Mode
2. Run 'slmgr.vbs /ipk <PRODUCT_KEY>' command:
3. Please wait until Windows Script Host dialog appear to show the result.
4. Enter 'slmgr.vbs /ato' to activate windows