You may not believe this but a hacker halfway around the world can access your personal data and control your computer through the internet. This might be possible when your computer has not internet security protection installed. Somebody else might be looking at the contents of your display and harddrive. Another might also be writing a file into your computer to infect it with a virus or worm. Protecting the integrity of your computer that has linkage to the internet is a serious matter. Your credit card number and personal information are valuable items that can be traded and bought on the internet by malevolent hackers and syndicates. The idea of you losing money and be criminally prosecuted for a crime you know nothing about is definitely scary. You should not mind buying yourself some piece of mind and protection from the dangers of surfing the internet.