Old M4P files won't play

I purchased 5 songs in 2004 and they all played fine. I didn't use iTunes for awhile and when I reinstalled it 2 out of the 5 songs won't play. They're all M4P and when I click any of them to convert them to AAC I get an error message "could not be converted because protected files cannot be converted to other formats"
I have authorized these files for my computer which is another mess. I have only 1 computer but yet iTunes says I have used 3 out of 5 computers. I have reformatted my computer a few times in the last couple of years but have never changed my motherboard or cpu.
Windows XP 1.8GHZ, 512MB, Audigy

This link will explain how 1 computer may be using multiple authorizations. Once you get this straightened out, try to play one of the 5 songs to see if authorization will be accepted.
http://docs.info.apple.com/article.html?artnum=300161

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Message was edited by: schnapphase

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Old M4P files won't play

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