itunes duplicates

My itunes library has duplicated a load of entries (about 400 which is why i don't want to have to manually delete them), it's only the listing in the library not the actual file that is duplicated.
I have tried deleting the library file in the itunes folder and then importing the folder again but it has just duplicated them again.
Any suggestions wouold be appreciated.

Just to add to that, the listings are not duplicated on my ipod library just in itunes on my laptop.

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