a degree of patience is called for when trying to access both the Microsoft and anti-virus company's sites at the moment.
I'm sure you can imagine the amount of work that these people have been landed with over the past week or so, and Microsoft in particular have probably been concentrating on keeping their servers online rather than posting PR messages. The anti-virus companies will have experienced abnormally high traffic rates to say the least, but they'll return to normal very rapidly.
All I can suggest is that you keep trying - you are one of millions who are doing the same thing - and you'll eventually see success. As for McAfee taking your money - surely you don't expect them to stop doing that do you? I would imagine that over the past few days quite a few people have been very glad they paid McAfee for their anti-virus software.