How to Clear Recent Documents Automatically on Logoff
 

Clear recent documents automatically on logoff through this small registry edit.

1. Open Registry Editor (regedit.exe) click start, type regedit in search option.
2. Navigate to the key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Policies\Explorer
3. In the right pane, right-click on a empty area and select New - DWORD Value [or DWORD (32-bit) Value in 64-bit machines]
4. Name the DWORD ClearRecentDocsOnExit
5. Give the new DWORD a data value of 1
6. Close the Regedit window.
Done.

For vice versa just follow the below step.
Just change the value of ClearRecentDocsOnExit to 0.