Internet Security say "At Risk" due to definitions, last scan was in october 2012 ?!?!?

I don't know if my internet security has been compromised ?  It says "At Risk" and that my virus & spyware definitions are not up to date.  So I click fix and it does update and finishes ok.  But when I click close the message returns that my definitions are not up to date.  Also it shows my last scan as being 10-06-2012 !?!?!?  What's happening ?