It could be that the servers were having problems. What engine is your Anti-Virus and Anti-Spyware, Version: 16.8?
(Today's is 1738)
That MVT scan says your proxy server settings are incorrect, how do you connect to the Internet, is it via a proxy server?
If so there could be a problem which I think you would need Technical Support to deal with, see the link under Useful Links at the top of this page.
It's free of charge.
Well not sure what to suggest. There have been issues in the past with wireless connections but I thought they had been sorted out long ago.
In XP are you using IE8 and does it connect OK? (It doesn't have to be your default browser but McAfee uses it anyway).
If so contact Technical Support as I suggested.