Hi

Try updating your Wi-Fi driver and also unistall your Anti-Virus if expired (it can be a firewaal issue):

You can also try a Winsoc Reset:

Winsock Reset in Windows 8 and 8.1

1. Move the mouse to the upper right-hand corner of the screen to make the vertical menu bar appear. Click Search.
    
2. Type “cmd” in the search bar and hit the Enter key on your keyboard.
    
   
    
3. Right-click on cmd in the search results for Programs, and select Run as administrator. Depending on your computer settings, you may be asked to provide an administrator password before you can continue.
    
4. A black box with a flashing cursor will open; this is the Command Prompt. Type “netsh winsock reset” and then hit the Enter key on your keyboard.

   
    

5. Wait for the Command Prompt to run through the reset. Once it’s complete, you’ll see the message “Winsock reset completed successfully”.
    
6. Restart your computer to finish.

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