Any document that you open in Windows is added to the Recent Documents list. Now with this simple trick you can stop that!!!
* Start ==> Run ==> Type “Regedit”
* Right Click on the right Pane and create a new DWORD value.
* Assign Value Name as “NoRecentDocsHistory”
* Data Type as “REG_DWORD (DWORD Value)”
* If Value Data = 0 : disable restriction
1 : enable restriction