There may be a need for you to change your Windows 7 Key. This need maybe because :
* You are updating from Windows 7 public beta to a licensed version of Windows
* You were having a copy of Windows 7 which was not genuine but you have now purchased a license and want to update the Windows 7 key
* You have any other need because of which you want to change Windows 7 key
1. Go to Start Menu and search cmd, this will show command prompt result at the top
2. Right Click on this cmd.exe icon and click Run As Administrator
3. Type the following command:
slmgr.vbs /upk
slmgr.vbs /ipk
The first command will remove the present product key and the second command will update the new key.
4. If you the above step correctly with a valid License Key for Windows 7, you will see a success message like the one below:
5. Now you need to activate Windows online. For this Go to Control Panel > System
On this screen you will find the link to activate Windows. Click on the link which says
“Activate Windows Now”
6. You will see a Windows Activation Window as seen below, select the Retype Product Key option:
7. Type the Windows key again in this window and it will start an online validation if you are connected to Internet.
8. You will get a success message on activation on Windows