[speaker001:] What can I do?
[speaker002:] The system crashed when I was surfing on the internet.
[speaker001:] Did you go to any illegal website?
[speaker002:] No, But does that matter?
[speaker001:] Yes, your computer can be easily infected by virus if you do that.
[speaker002:] I see. I'd better never try.
[speaker001:] That's wise.
[speaker002:] Do you know what's wrong with my PC?
[speaker001:] One minute. Oh, yes, it was infected by a virus, and you had no antivirus software.
[speaker002:] Is anti-virus software necessary for a PC?
[speaker001:] Of course. You'd better learn something about it.
[speaker002:] I'm afraid yes. But what about the data I stored in the computer?
[speaker001:] 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?
[speaker002:] Yes, please. I'll really appreciate that.