My dad bought a computer when I was five years old. I could draw pictures and listen to music on it. But once, the computer was down suddenly. My dad told me that it might be attacked by computer virus.

I was so scared that I asked dad anxiously, "Did it get a flu? Did it need some medicine?" But dad laughed and said smilingly, "Don"t be silly, son. No medicine can cure a computer virus. It"s a problem of program." I didn"t understand what my dad said at that time. But I made up my mind to study hard and to be a computer expert in the future.