McAfee VirusScan Plus 2009 Edition for $9.99 shipped.  Here is a screenshot for your reference.  Alternatively, it is also available here for $9.99 with free shipping on orders over $25 with a screenshot for your reference.  It helps shielding PCs from viruses, spyware, and has a firewall to protect against network attacks.  It also features McAfee SiteAdvisor, an online safety guide that warns about risky web sites before users visit them.  Most places have it for over $30.