Yesterday Symantec released an update (signature file) for its Antivirus software. To ensure that your PC is protected from the latest viruses make sure you apply this update now. Either through the automatic update feature or by downloading it directly off of the Symantec website.
To see what versions of Symantec antivirus software this update applies to please check out the comments section of this post.
Download: 6/9/2004 rev. 19
News source: Symantec