did you try updating your sound driver?
EDIT: Also try turning off audio enhancements in the control panel for your sound card
scru
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>>All of the sudden my computer stopped playing music files
That happened to me too awhile back. Foolish me! I had turned off the power to the speakers
Ancient Dragon
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JUST TO GET A BETTER UNDERSTANDING when you click on the music files do they open the associated program but u hear no sound
bobbyraw
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codec packs = bad idea. I'm afraid you may have complicated your problem...
Just another note, sound drivers in Vista are funny things. Just because they play your login sounds and stream just fine doesn't mean they're okay. In fact, when I just got this computer earlier this year, I had a similiar problem, playing sound files was an iffy experience, and using enhancements was a non-no. It turned out that my drivers weren't quite ready for Vista, and updating fixed it all.
I don't know how to tell you to fi the slew of problems you may or may not have spawned if you installed those codec packs on top of each other, but at least try updating your sound card driver.
Just try it, it won't hurt.
scru
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