PC lockups

Hello,

 

I have recently updated to the latest version from my ISP Comcast.  Ever since then I have been having lockup issues. I had no problem with previous version.  This litterally started immediately after the upgrade. I am running Vista Home Premium SP1 with all of the latest patches and 3GB of memory.  The lockups seem to happen after live updates happen.  At first I thought it was just the background processes.  But, I changed that to 30 minutes and it still happens, just not as frequent.  This is very annoying.  I often do presentations and now I can't setup my laptop 30 minutes early because background processes take over and now I get lockups whenever updates happen when I am doing live webcasts.  Norton Security Suite says it is version 5.1.029  if I look in Help and About

 

Thank you