[peanut]

I take it you've tried the below in the order stated?

In the search box on the taskbar click Start, type command prompt, right-click the command prompt result and then select Run as administrator and confirm.
At the command prompt (decline restarting your machine until you have entered the final command):
Type ipconfig /release and press Enter.
Type ipconfig /flushdns and press Enter.
Type ipconfig /renew and press Enter. (This will stall for a moment.)
Type netsh int ip reset and press Enter. (Don’t restart yet.)
Type netsh winsock reset and press Enter.
Now restart your machine