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4 USE ANTIVIRUS SOFTWARE
If a machine is a member of a domain, it's best to run different antivirus brands on the workstations and network servers. When new viruses are discovered, antivirus companies eventually develop detection signatures, but it's impossible to know which one will first, or how long it will take. By using different brands of antivirus at different layers of the network, an organization increases the odds new malware will be caught. If one antivirus product doesn't have a signature, the other might.
5 ENABLE THE WINDOWS FIREWALL
| network breaches, it's tremendously important to use a firewall on each PC.
To manually enable the Windows Firewall, open the Control Panel and click on the Security Center link. Next, click on the Windows Firewall link. When the Windows Firewall properties sheet appears, click the On button (see Step 4, below), and then click OK.
This was first published in July 2008