Song plays for a few seconds then itunes changes song...

I just downloaded my music from my ipod 30g video to my itunes 7.6.1 onto my brand new (3 day old) macbook. Nearly half of the albums play around 12 seconds of each song then move on to the next song. Some of the songs also skip. I used to have a PC and switched to a Mac when PC died. What's the deal? Anyone else encounter this issue? Anyone know how to fix it? I am using the newest version of podworks and have the full version.
 
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