Windows has a built in VBScript to find out information about the Windows product key used during install and to replace or release it. The command to release a Windows Product Key is bolded and the line precedes with a star in the list of commands below.
To run the script, go to Start -> Run and type:
slmgr.vbs
No parameters will bring up the Help screen. Below is a list of parameters that can be
used. Useful parameters are preceded with a *.
Global Options:
/ipk
/ato [Activation ID] - Activate Windows
/dli [Activation ID All] - Display license information (default: current license)
/dlv [Activation ID All] - Display detailed license information
/xpr [Activation ID] - Expiration date for current license state
Advanced Options:
/cpky - Clear product key from the registry (prevents disclosure attacks)
/ilc
/rilc - Re-install system license files
/rearm - Reset the licensing status of the machine
* /upk [Activation ID]- Unistall Product Key
- Works when leaving [Activation ID] field blank.
Options for Activating Windows
/dti [Activation ID]
- Display Installation ID for offline activation
/atp
- Activate product with user-provided Confirmation ID
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