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