turn off frequent windows 7
Change (Increase or Decrease) Number of Recent or Frequent Items Displayed in Windows 7 Taskbar Jump List
Jump List in Windows 7 allows user to easily access and open frequently used files or recently opened documents associated with the particular application or program, simply by right clicking or slide up gesture on the program button on the Taskbar. Since Windows 7 RC, the number of recent items or frequent items appear on the Jump List has been defaulted to 10. Users who want to change, either increase or decrease the number of the items on Jump List can do so easily using below trick.
Change and modify the default number of frequently used or recent items in the Windows 7 Jump List