RE: OT/Viruses, Worms etc...I have been using Norton AV with auto updates for some time. I had it on my old desktop PC as well as my current desktop with XP & my corporate laptop. IT is important to keep up the subscription to the autoupdates feature. Since I use a cable modem with home network, I am always on line so it can grab any needed updates quickly as they become available. I believe Norton AV is about $75 CDN which comes with one year of free updates & then the ongoing subscription fee for updates is about $30 Cdn. I have never had a problem & it has caught a few viruses trying to enter my space. Well worth the money, Cheers!!!