How can I change the license key on Windows-8

I have Windows-8 running. I set it up at home using my own license key. However now I need to change the license key to use it at work.

In the past I've managed to do this by editing the OOBETimer file in the windows registry to deactivate Windows and then I could re-activate it with the new key. I can't do this on Windows-8.

Does anyone know how to do this?

Launch A command prompt as Administrator and enter you key in this command

slmgr.vbs -ipk YOUR-ACTIVATION-KEY-HERE

You will get a confirmation for the product key that you have entered.

Then, run the following script to activate the product key

slmgr.vbs -ato

Finally you will get a confirmation on product activated successfully.

For using GUI, use

slui 3

There are two ways to do this.

Via GUI

1. Windows+R to open the Run dialog, run slui.exe 3.

2. Type your 25-digit product key, and click/tap on Activate.

   

3. Then it will try activate, and hopefully, it will be successful.

Source: http://www.eightforums.com/tutorials/8855-product-key-number-change-windows-8-a.html

Via command prompt

You could try this. This is also mentioned on a blog.

1. In command prompt as Administrator (replace SSSSS-TTTTT-UUUUU-VVVVV-WWWWW with your key)

    slmgr.vbs /ipk SSSSS-TTTTT-UUUUU-VVVVV-WWWWW
   

2. Then activate Windows.

    slmgr.vbs –ato
   

You’ll see a pop up message once successfully activated.