Another Itunes Problem!!

I am having some real troubles on itunes. Basically, i was once again greeted by those bloody exclamtion marks next to the majority of my songs the other day. I have been manually redirecting them and now they are working properly again (im sure there was a quicker way, but just stuck with this)

Although now. i also used Senuti software to copy all songs from my ipod to my mac, so that the songs could be found again, (again this can’t of been a good move) because now, i have at least 5 copies of each song in my itunes music folder, i’m unsure why, i know i clicked ‘transfer’ on senuti a few too many times though!

I really don’t want to go through and manually delete each song. I’ve consolidated my library, hoping that this might knock out any existing copies but hasn’t…

Can anyone help? Would it be easier just to delete all the music on my mac itunes and use senuti again to transfer from my ipod back to the mac?
I would really appreciate any suggestions, thanks