Clear the Run history on the Start menu
Windows saves a history of the file names, programs, and locations you type in the Run dialog box. You can delete this history, which you might want to do if you're using a shared or public computer.
Open Taskbar and Start Menu Properties by clicking the Start button , clicking Control Panel, clicking Appearance and Personalization, and then clicking Taskbar and Start Menu.
Click the Start Menu tab, and then, under Privacy, clear the Store and display a list of recently opened programs check box.