How do I get an updatet vius def. file to my old Antivirus program ?

On my COWI employer bought home DELL / Vista PC, I use Symantec AntiVirus 10.2.0.276 from 2006, and SARC Intelligent Updater version 4.01.59, which seems not to update my virus def. file no more. My def.s file is from Aug 19th 2013 (more than 30 days old).

What do I do to make the SARC download a fresh def.s file ?

regards,
Per