We highly recommend Trend Micro Antivirus/Antispyware. Whenever you go to buy the software, just buy the latest version you can buy at the time. The more recent versions have script detection and blocking capabilities. This is very useful in the war against trojans and evil scripts that may be loaded to your system by evil websites. We call them evil, because the only purpose for these scripts is to invade and take over your computer for bad and often illegal uses. Updated antivirus/antispyware software is a key component in your system's defense mechanism. Trend offers free tech support.

If you have need for two licenses, you should look at a 3-user pack. It is cheaper than buying two licenses separately. And if you have need for 5 licenses or more, get a volume license agreement for the antivirus software.