Bad news guys....had this when we asked symantec :-
Symantec Antivirus 8.0 reached its End of Support Life as of November 30, 2005 and Symantec Antivirus 8.1 reached its End of Support Life as of January 31, 2007, as defined in the Symantec Enterprise Technical Support Policy. Therefore virus definition updates are no longer supported for this product
So no more updates, guess you have to rush through a project to upgrade your systems, fortunatly we'd already started but this was a major shock.