wmp 10 is telling that the file extension is wrong when its not!!!

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Joined: 01 Aug 2006
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i am receiving an error when trying to open many of my media files with windows media player 10. the error is:
“windows media player cannot play the file. The player might no support the file type or might not support the codec that was used to compress the file”.
I have tried to open up these same files with a different media player and I am unable to open them still. Also, I have tried to download several codec packs and individual codecs, which I have since deleted, but they did not help. I have downloaded gspot and it will tell me that I have a codec for a particular file, yet that file will not play. For the other files that wont play gspot doesn’t even recognize format, and it will be an avi for the most part.
Also when I try to open some files they will play a different file: for example, I will open an audiobook and one of music files will start to play.
Im asking for audio/video help, but in actuality I have pdf’s that give me the same error about not able to recognize extension, possibly due to decompression method.
Any one familiar with any of this?