Hi there
I'm presuming you're using Win7 ... ?
Below are guidelines I had found online and used before, to get rid of the recently opened files in Acrobat 10 ... maybe the same works for the 9 Reader:
1. Open the Start menu and type "regedit" in the "Search programs and files" field. Press "Enter" to launch the registry editor application.
2. Open the "HKEY_CURRENT_USER" folder on the left side of the window.
3. Open the "Software" folder.
4. Open the "Adobe" folder.
5. Open the "Acrobat" folder.
6. Open the "10.0" folder. (maybe in your case the "9.x" folder)
7. Open the "AVGeneral" folder.
8. Right-click the "cRecentFiles" folder under the "AVGeneral" folder and select "Delete."
9. Click "Yes." This clears the recent document history from Adobe Reader X.
The next time you run the application, it recreates the "cRecentFiles" registry key and begins tracking the document history again.
Hope this helps
