slow network access.

prior to installing Norton Business Suite, loading a page from the dedicated server to my screen took about 2-3 seconds. After installing, it is taking 24-26 seconds. Remove it and it goes back to 2-3 secs. (it exhibited the same behavior with AVG and McAfee!) I've seen other posts of a similar nature and their solution is to remove NBS. I'm running Win 7 on a gigabit network. Is this really the only solution? , I've tried disabling the firewall with no effect, changing settings, etc. no success. I am behind a firewall so I don't really need the individual firewall protection on this computer but I would like to keep the AV.