There are literally thousands of different viruses and spyware specimens that can plague a computer. Unfortunately, these can sometimes render a computer completely useless. Sometimes these viruses can be removed, but even when they can, it's still better to protect the computer from being infected in the first place. Fortunately, though, most viruses and spyware are completely preventable. Programs such as Norton Security protect against both viruses and spyware. Installing Norton Security is fairly simple.