PC Itunes transfer via external drive, duplicate issues
I tried to transfer Itunes from my Windows7 PC to an external drive following apples instructions. I no longer want to use the PC for itunes purposes, I would like to use my Windows7 laptop. The transfer appears sucsessful, all 57GB. I loaded Itunes to the laptop, connected the external drive. Opened Itunes per apples instructions using shift key to add library. After transfering for several hours, itunes now says I have 99.3GB of music. I looked for exact duplicates, and it shows I now have random duplicated files in the library. The individual files on the external drive only show the single file, but the libray shows duplicates, to the tune of almost 2000 songs and almost 30GB.(theres also duplicate movies and podcasts). I thought I did something wrong, so I deleted everything a tried again. Itunes library now says I have 133GB of music, 3-6 duplicates of songs, movies, and podcasts? HELP!!
Itunes-OTHER, Windows 7