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a.       Exit Windows Media Player.

b.      Click Start, type“%LOCALAPPDATA%\Microsoft\Media Player” (without quotes) in the Start Search box, and then press Enter.

c.       Select all the files in the folder, and then click  Delete on the File menu

Note: You do not have to delete the folders that are in this folder.

d.      Restart Windows Media Player.

Note: Windows Media Player automatically rebuilds the database

http://answers.microsoft.com/en-us/windows/forum/windows_vista-windows_programs/duplicate-files-in-windows-media-player-11/1e7f4187-c92a-4c6e-b8f8-56b92dd8814c

1. Click the Windows Start button and type %APPDATA%\Mozilla\Firefox\Profiles\ in the Search box at the bottom of the Start menu, without pressing Enter. A list of profiles will appear at the top of the Start menu.
2. Click on the profile with “default” in the name to open it in a window.

http://support.mozilla.org/en-US/kb/Profiles