Click Start , type cmd into the search box.

slmgr.vbs /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX For example:

If you need a legitimate Windows 7 key for a legal installation, check with authorized resellers or your original computer manufacturer. Avoid key generators or cheap online sellers—they often deliver non-working or volume-licensed keys that will be blacklisted by Microsoft. Have you successfully changed your product key? Let us know in the comments below (if applicable) or share which method worked best for you.

Click the Start button (Windows logo) at the bottom left of your screen.

Right-click on cmd.exe in the search results and select Run as administrator . Click Yes on the User Account Control prompt.

slmgr.vbs /ipk 12345-67890-ABCDE-FGHIJ-KLMNO Press Enter . A pop-up window will appear (the Windows Script Host). It will say: "Installed product key successfully."

Scroll down to the bottom of the System window that appears. Look for the section labeled Windows activation .