Like Lotr says, DID you alter or describe them at all in L/W.
It dose sound like a file recignision bug.
Try removing the ones marked in red from WMP then somewhere in settings
Rescan your COMP for media files (sorry I havent used WMP for ages) its not running on my comp, so this is from memory.
Post if it dose or not work cos it helps others.
Peace,

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mickjapa108