anti spyware out of date?

hello, I hope somebody can help me,

My little icon in the right bottom of the screen keeps coming up as the nortonsign with a red cross. A popup screen says my anti spyware is out of date and my computer is at risk. If I do the fix it thing it goes for ever and then says protection updates not fixed.

I do have a valid version till September 2012. How do I fix this? Many thanks, GJ.