To (hopefully) help answer your question with a few others:
What OS are you running?
Did you install anything recently before the problems started? Anything that could reassign itself to be a default player for certain filetypes?
Have you scanned for viruses and spyware?
You might try and use system restore (assuming you're running winXP) and restore to a point before the problems started. It may be a long shot, but I've been saved by it on a few occasions - and never has it messed a system up worse than it was already.
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Charlie was a chemist but Charlie is nomore, what Charlie thought was H2O was H2SO4
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