I THINK UR PHONE HAS A VIRUS IN UR PHONE MEMORY. TRY THIS . HOLD THESE THREE BUTTONS AND RESTART UR PHONE .THESE BUTTONS ARE "*(STAR)" , "3(THREE NUMBER)" AND "THE GREEN CALL BUTTON" HOLD THESE THREE BUTTONS AT SAME TIME. IT WILL COMPLETELY FORMAT UR PHONE. AND UR PROBLEM IS SOLVED 100%LY IF HELPFUL THEN RATE PLEASE
not only gallery, filemanager and blue tooth also does not open in this problem. it is the problem of damage of your bluetooth ic. just change it in your nokia care centre. it just 600 of cost. after that you had no problem on opening ur gallery.