How to activate a Microsoft Windows 7, 8.1 key?

Activating a Microsoft Windows 7, 8.1 key is really simple, just follow these steps: 

1. Open Start menu, 
2. Type SLUI 04 and click on the keys icon,
3. Choose your country, and call the toll-free number. 
4. Follow the instructions provided by the automated activation system to receive a confirmation ID and activate your OS.

Are you getting error code 0xC004C008 during activation? Check out our guide on how to resolve it! LINK 

The key is not working

If you have activated the key according to the guide but the code appears not to work, please check what type of error message you receive and depending on it follow the appropriate instructions:

• My key is Duplicated / Already used
• My key is Invalid
• My key is region locked / can't be activated in my country
• My key activated a different product
• My key did not activate all of the content