After using several antivirus software packages.  I went back to Panda Titanium 2006.  The company it self,

stays ahead of the virus game, and posts on their site, an on-line virus removal system.  They also post anti-virus removal tools at Panda Software.  After using, microsoft one care, Norton System Works 2006, and McAfee I was fed up.  I finally got Panda.  Panda found 47 viruses.  13 trojans. and 6 norton viruses that were designed to kill norton in itself.  Panda not only removed the viruses, it killed the trojans.  Panda titanium, also comes with a firewall.  A better and easier to use firewall, than zonealarms, or norton.  Automatic updates for a year.  That can notify you of the download, or you can turnoff so there is no interruption while surfing.  You can go to panda on line and for $49.95 download the software, or you can buy it here on E-Bay for less, and still end up way ahead of the game, and get rid of those nasty bugs on your system.