Where would that be then, Bob? Oh yes, I remember:

http://forum.avast.com/index.php?topic=57929.msg488338#msg488338

Yes, this scam does involve installing anti-virus programs:

The callers then use remote login software to gain access to the user's computer, and "fix" the problems; in some cases they also install programs including antivirus and even entire operating system upgrades. They then demand a fee.

The UK police have determined that the actions constitute fraud because there is nothing wrong with the users’ machines, and that the money is extracted under false pretences. Scores of people who have contacted the Guardian after being scammed have demanded, and usually received, repayments from banks and credit card providers.

Information passed to the Guardian by sources familiar with the volume of transactions made by the fake support call companies suggest the scam is worth roughly £2m per year. It has grown in size over the past two years, and is believed to be masterminded by one man based in the city of Kota in Rajasthan.

http://www.guardian.co.uk/technology/2011/sep/22/microsoft-drops-partner-accused-scam

Perhaps part of the reason the scam was able to grow for so long was the attitude of people like you Bob?