by 
The Curious Bag
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Virus protection is a critical component to any computer installation. Regardless of the operating system, an unprotected computer remains exposed to malicious software if it does not have an installed antivirus solution.
Helps Secure Sensitive Information
Viruses may expose sensitive data such as your bank account, credit card information, social security number and other personal details and may transmit this information to criminal enterprises.
Helps Prevent Data Loss
Left unchecked, viruses may corrupt a hard drive to the point that its data becomes irretrievable. If the data is not backed up elsewhere and is unprotected on the hard drive, risk of permanent loss remains high.
Thwarts the Zombie Effect
Left unprotected, your computer can become a "zombie," unwittingly serving as an online tool for criminal elements, passing on spam and electronic detritus via e-mail to other computers.
Fights the Spread of More Viruses
Viruses actively seek to spread themselves to other computers. Unprotected computers serve as conduits for continued contagion whenever contact with other computers occurs.
Saps Productivity
The amount of time spent cleaning and restoring an infected system can be a considerable waste and pulls you away from more productive computer-related activities.
Source:
Important Facts About Virus Protection -- University of Louisville
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