Symantec AntiVirus, version 8.x is no longer supported, and was discontinued as of November 30, 2005. Virus Definitions are no longer tested against discontinued products, and compatibility issues (such as these) may occur. In addition, older, unsupported versions of Symantec AntiVirus may not be able to protect your computer or environment against newer threats. As these threats are discovered, and designs are implemented to protect against them, they are included in the most current version of our products. http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2008011814394548?Open&seg=ent