How to clear/remove Recent Documents history in Windows 7

This tutorial will explain How to clear/remove Recent Documents history in Windows 7
Method 1
Recent Items listed in the start menu are stored in:
%appdata%\Microsoft\Windows\Recent
To delete, you can either right-click on Recent Items from the start menu and select Clear recent items list or you can empty the folder from inside Windows Explorer
Recent items listed in jump lists are stored in:
%appdata%\microsoft\windows\recent\automaticdestinations
To delete, empty the folder from inside Windows Explorer, or from the command prompt using
del %appdata%\microsoft\windows\recent\automaticdestinations\*

Method 2
1. Go to Start menu, and type gpedit.msc in the search line and press Enter.
2. If prompted by UAC, click on Continue.
3. Now go to this folder : User Configuration\Administrative Templates\Start Menu and Taskbar.
4. once you got to this folder, you will find ‘Clear history of recently opened documents on exit’ in the right pane, just double click on it.

Source: http://www.windowsreference.com