One of the most well-known ways of protecting your computer from viruses and hackers is to use an anti-virus program. These programs scan your computer for malicious software and alert you to their presence - they will usually attempt to remove the virus for you also or, alternatively, place the file in quarantine.

*This video is part of the GreenLightPC security series*

http://www.youtube.com/watch?v=62dOCQX43uQ&feature=plcp