Cleaning Recent Docs Menu and the RUN MRU

The Recent Docs menu can be easily disabled by editing the Registry. To do this go to the following Key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Now in the right pane, create a new DWORD value by the name: NoRecentDocsMenu and set it's value to 1. Restart Explorer to save the changes.
You can also clear the RUN MRU history. All the listings are stored in the key:
HKEY_USERS\.Default\Software\Microsoft\Windows\CurrentVersion\Explorer\RunMRU
You can delete individual listings or the entire listing. To delete History of Find listings go to:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Doc Find Spec MRU and delete.