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Just to add, to what JohnnyRoyale above has said, 80 to 90% of the time viruses are coming from the outside.
Each security measure has a flaw. As I found out yesterday.
Antiviruses are only as good as the latest update. Any virus past that update, as well as new viruses pretty much renders your antivirus software useless.
Firewalls, can't prevent viruses, worms, or trojans from working their way through your network. If someone downloads a virus, trojan, or worm guess what, your firewall isn't going to save your @ss.
I think the solution, to most of the virus problems is that more time needs to be spent on education. If you give someone an idea what to look for and what to avoid, im pretty sure that you will spend less time dealing with viruses.
Also another thing that researchers are beginning to say is, "use another alternative to internet explorer". Mozilla, Opera, Avant, are all exceptional browsers.
Also another deathtrap is, Outlook Express, a great number of viruses are email viruses. Educate your users, to take precaution before opening attachments. In fact if possible avoid using outlook, instead use a web mail service, and let the mail service deal w/ the viruses.
Tell them also to avoid attachments w/ filenames w/ the following extensions, .exe, .vbs, .com
Another thing is if they bring work from an outside source, on a cd, usb drive, flash media, they should do a virus scan, before they bring it in.
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