The U.S. Computer Emergency Readiness Team recommends 

Do Not Follow Unsolicited Links

   It is generally a good practice not to click on unsolicited URLs

   received in email, instant messages, web forums, or Internet relay

   chat (IRC) channels. However, this practice does not always prevent

   exploitation of these types vulnerabilities. For example, a trusted

   web site could be compromised and modified to deliver exploit script

   to unsuspecting clients.

Symantec Security Response encourages all users and administrators to follow basic security "Best Practices"

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
• Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
• Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
• Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
• Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.

Contact us if you have questions about "Best Practices"