Can't open NIS.

Hello,

 

I've had Norton Internet Security on my computer for a long while, however I have been starting to experience problems opening the NIS menu. NIS still works, and I can do all of it's features by right clicking the icon and select, as example, quick scan.
All these options work but I still can't just open NIS itself.
I also don't remember exactly when this problem occured for the first time.

I did also find some similar posts, however they did not gave me a solution.

 

Hope any of you can help me.

 

Thanks in advantage.