I have been to several non-tech networking/CoC-type meetings, and my problem is that after saying I do web development, the conversation usually quickly turns t

I have been to several non-tech networking/CoC-type meetings, and my problem is that after saying I do web development, the conversation usually quickly turns to "my PC has some kind of virus". I suppose I should see this as an opportunity of some kind (installing antivirus software an "in"?), but I want to avoid becoming someone's 24x7 Windows tech support guy.