How do I delete all music duplicates at one time?

HOW DO I DELETE ALL MUSIC DUPLICATES AT ONE TIME IN THE iTUNES LIBRARY?

DELL COMPUTER

WINDOWS 7 HOME PREMIUM

SERVICE PACK 1

INTEL(R) CORE(TM)2 DUO CPU T6600 @ 2.20GHz

INSTALLED MEMORY(RAM) 4.00 GB

SYSTEM TYPE 64 BIT OPERATING SYSTEM

CAPACITY 100GB

I HAVE HAD THIS COMPUTER HARD DRIVE REPLACED RECENTLY AND HAVE MOVED THE MUSIC FROM THE EMBEDDED iTUNES MASTER LIST IN THE MUSIC LIBRARY ON THIS COMPUTER.

I PERFORMED THIS ACTION WHEN THE iTUNES MUSIC COULD NOT LOCATE THE SONGS.