HELP!!! My FS is possesed

[Funkycowboy63]

For about the last three days  whenever I try to start FS I keep getting crashed by a sound file error.  The error messege says:

Soundlib-Fehler
sound.lib-ungueltig

Now, for one thing, that error message is german.  I have never installed any add-on to FS either published in Germany or in the German language.  The last time I used FS was March 16th and all I did was fly from my home in PA. to Bristol, TN for the NASCAR race with my Commander 115.  I installed or downloaded nothing.  My  Norton could detect no worm or virus and defrag and scandisk full did nothing to correct this error either and a manual search through my FS directory has found nothing unusual.  Does anyone have any idea what could caude this or has anyone else ever had a similar experience??  Someone please help if possible, thank you in advance.