If you don't want a history of your documents, follow the next steps:

1. Click Start and select Run. Type gpedit.msc to open the Group Policy editor (see picture 1).
    

   Picture 1

2. Go through User Configuration - Administrative Templates - Start Menu and Taskbar (see picture 2).
    

   Picture 2

   
   
3. Double click "Do not keep history of recently opened documents" (see picture 3).
    

   Picture 3

    
4. Click on "Enabled" then OK and there you have it (see picture 4).
   
   

   Picture 4