The most common method used for spreading a virus is through e-mail attachments. The most common tool used to mitigate the risk and danger of this threat is using a virus scanner which attempts to scan a computer program before it runs. Another tool against viruses is common sense. Don't open an e-mail from an unknown or suspicious source unless you know the risk of opening the attachment. Avoid the risk of malware with the following:
Keep your computer software current. Both the operating system and the anti-virus application must be updated on a regular basis.
Only download updates from a reputable source.
Always weigh the risks of installing something on your computer. This includes reading the fine-print license!
Install and use a firewall.
"Prevention is always better than cure." Businesses