Check out the McAfee description here. They provide a complete description of the virus and manual removal instructions for people who aren't running McAfee VirusScan software.

After your problem is fixed, give serious consideration to Kat's suggestion or move your email to hotmail or msn (same mailer) where they perform virus scans before you open the mail.

      - Mark

NB: If Symantec really doesn't know how to remove the virus, you might want to switch to McAfee.