Virus and spyware are not up to date

I am running the free security suite available with comcast.  LiveUpdate runs and tells me that the virus and spyware are not up to date.  I hit fix now button and it tell me that to receive most current  updates to restart computer.  After 3 attempts I get the same messages.  Tried uninstalling and restarting from scratch which worked a few weeks ago, but I get nothing.  Anyone have any ideas?