In case if you were referring to what screenshot #1 points out to, then it would be caused by enabling (checking the box for) "Use Personalized Menus" option.
To remedy this: Right-click on Start > Properties > click on Start Menu tab > click Customize... button > scroll to the bottom of the "Advanced Start Menu Options" and uncheck the box for "Use Personalized Menus" option as seen in screenshot #2.

Screenshot 1:


Screenshot 2:

~TL