Some antivirus utilities are better than others, but even the best of the best are only around 60% effective at detecting threats. That said, in a corporate environment having one of the better ones is a good idea and certainly better than nothing. But I've noticed a lot of companies buying TERRIBLE antivirus "solutions" that not only never detect anything, but are horribly expensive. CA Etrust and Trend Micro OfficeScan are the worst I've seen in this category (ie, in the 7 years I've worked for companies that use one of those 2, I've never once seen either one successfully detect or remove anything). Actually I take that back, I DID see Etrust flag *itself* as a virus once and remove itself. That was rather amusing. On another note, I was on a gaming forum (where you'd think people would be a little bit more tech savvy than the average person), and someone was arguing on the tech support forums, saying they couldn't possibly have a virus because "they pay for virus protection".