Computer viruses are malicious or mischevious programs that hide in web pages, email messages, documents, and other programs.  Their purpose is two-fold -- do harm to your computer, and spread from your computer to other computers.  Most viruses today travel over the Internet, and enter your computer through your Internet connection.  If you have access to the Internet, antivirus software is an absolute must.  Once you have antivirus software, it's also an absolute must to keep it up to date.

The viruses listed below are the ten most commonly reported and widespread viruses for the previous month, not the most recent viruses to appear.  These are the most likely viruses to infect your computer.

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Information courtesy of Sophos, a major provider of enterprise and small business antivirus solutions.  Visit http://www.sophos.com for more information.