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Sound (wav file) has mysteriously changed

The sound coming out of the computer for manual probe changes and other operator messages has changed to some funky sound like a string broke on a banjo. (Banjos... RUN!! Runner tone2 LOL). Any idea HOW or WHY it changed?? It was fine yesterday, and I didn't do anything to change it. Now today its that God-awful sound. How do I get the "normal" sound back? I found the wav files folder and clicked on them, but none of them are THAT sound, and I see no listing for "operator comments" or the like.  PLEASE HELP!!  Thank you.