Step 1. Click the Start button. Right-click on Computer and select Properties. This will open the System Properties window. You can also press Win+Pause.
Step 2. Click the “Activate Windows now” link at the bottom of the window. The software will attempt to detect an active Internet connection. If one is detected, the "Activate Windows online now" option will be available for selection. If it is not available, check to make sure you are connected to the Internet.
Step 3. Enter your Windows 7 product key at the prompt. You must enter a valid 25 character key in order to activate your copy of Windows. If you don't have product key, you can click: http://bit.ly/1ZDJdid buy a new one.
Step 4. Click .Next to activate your copy of Windows. The activation process may take a few moments. Once it has been completed, the activation window will display a confirmation message. To double-check that you are activated, open System Properties again (Right-click on Computer and select Properties). The bottom of the window should show the message “Windows is activated”.
