Windows Media Player Error: Service execution failed

Hi,
Recently, I have installed and uninstalled a myriad of programs during the course of trying to diagnose the memory problem. Now I am not able to play Windows media Player if I go to the Music or Video sections the Media Centre crashes. I got the following Server execution error message whenever I try to play an audio file. How can I fix this error? Have any idea?
Thanks for any assistance.

C:UsersBradfordDocumentsbluedragon.wmv
Server execution failed.
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