Change Windows 7 Key and Activate with new Windows 7 key

Hi, here again we discuss about the computer that need to change a new key product.
In this section, we scope it on the windows 7 only.

Sometimes, this need to do when:

• 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 

Lets do it together:

1. Firstly, go to Start Menu and search "cmd", this will show command prompt result at the top as shown below:

2. Right Click on this cmd.exe or cmd icon and click Run As Administrator:

3. Type the following command:
     slmgr.vbs /upk

this is for clear the previous key product.

after that

type : slmgr.vbs /ipk

this is update ur new product key.

example:

 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. Laslty, You will get a success message on activation on Windows.

  Source :

• hsolved-change-windows-7-key-and-activate-windows-7/ 
•  How to Change windows 7 Product key
•  http://tfy2012.blogspot.com/2012/06/how-to-change-windows-7-product-key.html

So, if u need ask something that u dont understand, commend me here!