Changing your product key for Windows 7 requires some command line to be written on Command Prompt.
1 - Press on the start menu, Choose All Programs.
2 - Go to Accessories then choose Command Prompt.
3- At the Command Prompt with the black screen type this line:
"slmgr.vbs -ipk 'Your New Product Key' "
slmgr.vbs -ipk JFVGC-DXVCS-SSFCX-DWGOR-RRGFG
and press Enter.
This line will change the product key of your Machine, it may take a while and then a new window will appear saying that your product key has been changes successfully.
After changing your product key, you need to activate your license.
4 - at the same Command Prompt window, type the command line mentioned on step 5.
P.S. if the entered product key is correct, a new window will appear saying " Your Windows Version is genuine".Tags: change, how, product key, windows