Change Product Key In Window 7.

Step 1:-

Open Cmd Then type 'regedit' (Without Quotation).You Will See One Window Press Yes Open It.

Step 2:-

See This Path Carefully
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\Current Version.

(it means click on this files
HKEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Windows NT
Current Version)

Step 3:-

Then See In Right Side Find "ProductId". Double Click On It.

Step 4:-

You Will See Your Product Key Then In This Bar You Can Change Your Product Key.


That's All. You Don't Need Any Software For It. .
Enjoy. . .