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For numerous reasons. With the number and nature of viruses out there, they can do anything from simply gumming up your computers operations to forcing you to delete everything and reload your operating system from the ground up [been there; done that]. Some can even cause physical damage forcing you to buy new hardware. But nowadays, that is just the tip of the iceberg - a good many viruses are content to use your system to send SPAM emails to your friends or force your browser to open websites you never wanted to see but others can program your computer to collect and secretly send information to hackers and organizations (including passwords and personal information), secretly intercept your website requests and redirect you to fake ones designed to trick you into giving critical personal info to thieves, or even install software to let hackers remotely control your computer and go through all the files on your computer at their leisure. There really isn't much viruses can't do.

Simply put, computer security is extremely important. It's worth doing your research and finding a good security program that will protect your system on several levels. Another simple thing you can do is NEVER surf the web using a user that has administrative authority. Set up a "power user" for your Surfing and only "administrative" authority when downloading needed updates and programs FROM KNOWN SAFE SOURCES. This protects your computer because only 'administrators' can install programs that will affect your computer permanently. Power users can download songs and pictures and such, but they can't install programs. If you don't understand what that means, that's okay, just go talk with your favorite geek or make an appointment with a local computer repair service and have them help you set it up and explain how to use it. And look into a good computer security suite.

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