I've just come back to work (abroad) after being back in the UK for 4 weeks, and suddenly I have this problem. I've tried in three different places now (using both ethernet and wireless connections) and I'm getting the same message: it's connected, but there's no Internet. When I run the troublershooter it finds two potential problems:
1) "Windows can't communicate with the device or resource (primarily DNS server)
2) "Security or firewall settings might be blocking the connection"
Sorry if there's an easy solution, which I imagine there is, but I'm a total technophobe and I couldn't find any solution after browsing here. Any help would be very gratefully received!