From Windows Desktop, click on Start/Find/Files or Folders.
In the "Look In" Window browse and select "My Computer". In the "Named" Window, type in *.rtf. The (*) is a wild card. Click on the "Find Now" button.Every RTF file on every drive in your computer should soon be listed.
Next time you do this, you will probably want to search only the "C" Drive. Browse until you find it in the "Look In" window.