Hi I can't connect onto my msn (i have the latest messanger) I just keep getting this message;

failed to connect to the service. This could be due to improper proxy or firewall settings. Please review your proxy or firewall settings. Proxy settings can be accessed through windows live messanger options. For firewall settings, please see the retailers instructions.

I've tryed turning my firewall off, then tryed it back on but it still wouldn't work I also tryed trouble shooting it and it had a problem with the 'Key Ports' I clicked repair but it wouldn't work, if anyone could help me at all? please help me

Thank you.