Do you mind giving out free advice to potential customers? For example, a customer calls you up and explains that a virus has been found on his/her computer. This customer asks you if there is a good, free virus scanner/remover that can be installed. Would you go on to offer the customer some basic advice, such as recommending a virus scanner, deleting temp files, scanning in safe mode, clearing system restore, running a firewall router, and using limited user accounts for internet purposes? I'm sure that a caller would appreciate receiving the free advice, but did you just kill a service call? Where do you draw the line between free advice and paid service?