Could you come and help me mend the computer, Neel?

What's wrong with it?

I can't log on the internet again.

Let me see. Did you change anything on your computer?

No, never.

What kind of anti-virus software do you use?

I don't have this kind of software.

Are you kiding? You have to install an anti-virus software on your computer. If not, you will be attacked by viruses, and it can lead your computer into failure.