Repairman: What can I do?
Benjamin: The system crashed when I was surfing on the internet.
Repairman: Did you go to any illegal website?
Benjamin: No, But does that matter?
Repairman: Yes, your computer can be easily infected by virus if you do that.
Benjamin: I see. I'd better never try.
Repairman: That's wise.
Benjamin: Do you know what's wrong with my PC?
Repairman: One minute. Oh, yes, it was infected by a virus, and you had no antivirus software.
Benjamin: Is anti-virus software necessary for a PC?
Repairman: Of course. You'd better learn something about it.
Benjamin: I'm afraid yes. But what about the data I stored in the computer?
Repairman: Don't worry, it should have been protected automatically. And I take an anti-virus software with me. Do you want me to install it now?
Benjamin: Yes, please. I'll really appreciate that.