problem with Internet Security 2008

I installed Norton’s Internet Security 2008 (came with the computer when I bought it but never used it) and updated but it still says I am at risk and has a red X and says FIXNOW and when I click on that it goes through the motion of updating but still has that red x and still says at risk.  Also, in the Network Security Map it says that 249 computers are connected.  This started off with 1 but started to climb.  I only have on computer.