Every time i click on a name on my yahoo mesenger the program closes, how can i make it stop?

y is it that every time i click on a name in my yahoo mesenger window, it closes the program?

Every time i click on a name on my yahoo mesenger the program closes, how can i make it stop?
keep with it, sometimes glitches happen and then the techies are trying to repair,it wont work while being repaired .... so try later on