change the way security center alerts me grayed out?

HI ppl.

I have a little problem... I have Windows XP pro with SP2 installed and also have symantec norton installed. I have never noticed this before (as i prob never checked it out before) but when I go to my Control panel-->Security Center-->and on the left the 5th option that says change the way security center alerts me is grayed out...now is this grayed out becasue I have norton installed? as I remember at one point I use to have a secuirty popup in my task bar which i dont have any longer, I have ran spybot etc and it picked up a registry key change (i think it was something like windows sec center disabled or someting... can any one adv me that if it is a norton thing or do i have some spyware/malware? cheers