Intermittent Internet Connectivity Problem. Sometimes freezes Windows XP. Help please, anyone?

We switched from Comcast to Veriozon FIOS about a month ago.  Everything has been fine with the internet connection until recently.  I have two computers running Windows XP SP3, hardwired to the Verizon wireless router. One has Norton and one has AV Antivirus programs running.   Computer 2 suddenly started strange, occasional symptoms.  Click on a desktop shortcut icon (any of several, such as Yahoo or Ebay).  Intenet Explore begins to load and then freezes.  Entire Windows seems to lock up.  Use Windows taks manager to try to stop NOT RESPONDING IE.  Sometimes successful, sometimes we had to just shut down and reboot the computer.  Retry internet by clicking on the tray E for IE icon....no problem getting on line.  10 minutes later, leave internet.  Try again...XP freezes up.   In many cases a short cut icon to internet would not work twice.  Sometimes Computer 2 would go days WITH NO **bleep** PROBLEM.  Now for the last week, computer 2 is running properly, but today, good old reliable No 1 is acting up the same way.  All OK 70% of the time...big headache the rest of the time.   I even noticed a report from AV antivirus that internet connectivity was lost.  Then apparently restored. 
Anyone have a clue what's going on?

Thanks for the first two replies.
1.  Norton and AVG antivirus ran last night.   No problems.  Spybot also was run.   So I don't think the problem is related to Arun's ideas.
2.  I have a MI424WR Verizon router.   The WAN light is on solid green, all the time. The Internet light flashes.
The router is fed by coax.
I dont know what bit torrent is.   Computer 2 is only used for Pogo on line simple stupid gaming (I am whining about wife's activities).   My Computer 1 is only used for ebay and simple web activities.
I tried resetting the router once today...helped nothing.
Just now I could not get connected via shortcuts.   BUT---I can always get on line through Outlook Express.  And I got here via an email link.
go figure

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    M. B.      Feb 6 2004, 8:20 am     hide options
    Newsgroups: comp.os.ms-windows.networking.windows
    From: "M. B." - Find messages by this author
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