Well that's entirely debatable, but Norton AntiVirus is right up there with McAfee im sure. Both McAfee and Norton are big names. I highly doubt your connection problem is security related, try posting in the network forum on this site.
Also, why pay for anti virus? I like AntiVir. It's found at http://www.free-av.com/
I duno...i just dont like the idea of paying money because people are a**holes
So...i found AntiVir. Works really well too. Actually, ive even found it better than Norton and McAfee, both of which ive tried.