You will have to do that from within the registry.
Ensure you understand how to backup and restore the registry if you are not familiar with it.
Click on Start and Run.
Type regedit and click OK.
Browse to the following location in the registry.
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
In the right hand pane right click on an empty spot and select New and DWORD Value.
Name it NoRecentDocsHistory
Double click on it and you should see a place to enter a Value data.
Change that to a 1 to Disable and 0 if you wish to Enable.
Mesich