First let me define Malware. From Wikipedia:
"Malware, short for malicious software, is software designed to infiltrate or damage a computer system without the owner's informed consent."
I spend a great deal of time trying to "protect and defend" my clients computers from malware. It is a never ending, ever escalating battle. And there is no silver bullet. You probably aren't interested in all the details of the attacks that confront every one of you, so let me just get to my recommendations.
First, have a good security software suite. There are probably several good products out there, but the only one I recommend is Kaspersky Internet Security. This changes frequently, but today it's Kaspersky. You can buy it at one of the links below:
Single Computer Version ($30 as of 12/2/2009)
3 Computer Version ($40 as of 12/2/2009)
Another tool you can use is OpenDNS. The process that controls your navigation about the Internet is DNS, or Domain Name System. I won't go into the details, you can go to http://www.opendns.com/ to read more.
Lastly, you can get and install a Host file. This is pretty drastic measure, but it will do alot to keep you safe. You can download a host file and read more about it here. Don't forget to update it periodically.
That's it for today. I am sure I will have more on malware in the days ahead.