You can download a 90-day free trial of BitDefender Total Security 2008.
It contains antivirus, firewall, antispam, antispyware, antirootkit, privacy control, parental control, tune up and backup. You need to install everything and cannot customise the components to be installed.
BitDefender also offers a 30-day free trial of Internet Security 2008. It includes the same features as Total Security 2008 except tune up and backup.
In addition, you can try 30-day of Antivirus 2008. It includes antivirus, antispyware, antirootkit and privacy control.