#Person1#: What can I do? 
#Person2#: The system crashed when I was surfing on the internet. 
#Person1#: Did you go to any illegal website? 
#Person2#: No, But does that matter? 
#Person1#: Yes, your computer can be easily infected by virus if you do that. 
#Person2#: I see. I'd better never try. 
#Person1#: That's wise. 
#Person2#: Do you know what's wrong with my PC? 
#Person1#: One minute. Oh, yes, it was infected by a virus, and you had no antivirus software. 
#Person2#: Is anti-virus software necessary for a PC? 
#Person1#: Of course. You'd better learn something about it. 
#Person2#: I'm afraid yes. But what about the data I stored in the computer? 
#Person1#: 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? 
#Person2#: Yes, please. I'll really appreciate that. 
#Person2#'s computer system crashed and #Person1# finds it was infected by the virus. #Person1#'ll install anti-virus software for #Person2#.
computer virus