Tim loved using his computer to games and chat with friends. One , he noticed that his computer was strangely. It was slow, and strange -up ads appeared on the screen. Tim 't know what to do, so he his older sister, Sarah, for help. was good with computers. She checked 's computer and discovered a spyware virus. is like a secret agent that what you do on your computer. downloaded a special tool to clean spyware from the computer. It worked! computer was back to normal. Tim an important lesson that day: always careful when using the Internet. He sure to keep his computer safe viruses.