The Little Black Book of Online Business: 1001 Insider Resources Every Business Owner Needs

65.1. COMPUTER SECURITY

To test your computer's vulnerability to intrusion from online sources, check out the "Shields Up" service at grc.com:

http://www.grc.com/

If the "Shields Up" service finds that your computer's ports are vulnerable, install some good firewall software. ZoneAlarm is one of the best:

http://www.zonelabs.com/

Antivirus software is critical as well. (These companies may also include firewall features, but I prefer to use ZoneAlarm.)

http://www.grisoft.com/doc/1/

http://www.avast.com/

http://www.mcafee.com/