In Vista and Windows 7, when you activate your copy of Windows by entering a product key, Windows saves the product key deep in the Registry.
Since there are many applications available to retrieve windows product key from Registry, you might want to delete the product key from the Registry to avoid someone extracting the key from the Registry with the help of software and then use it on his/her PC.
Luckily, Windows allows you delete the product key from the Registry without deactivating your activation. And the good thing is that you don’t need to search for the key in the Registry. You just need to execute a command to clear the key from Registry.
Follow the given below directions to quickly remove the product key from the Registry.
Step 1: In your Start Menu Search box, type “cmd” (without quotes) and simultaneously press Ctrl + Shift + Enter keys to open the Command Prompt as Administrator.
Step 2: In the elevated prompt, type the following command and press enter to delete the product key from registry.
Wait for “Product key from Registry cleared successfully” confirmation message and then, restart your PC to take effect. That’s it!
As said before, deleting the product key from Registry will have no effect on the current activation status of your Windows operating system.