I'm hoping someone can help me with a little annoyance.  I've searched all over Google and I've found plenty of solutions to problems similar to mine, but no solutions to my actual problem.  The other day, just out of the blue, my Start Navigation sound changed to ANOTHER sound (start.wav) that was similar, but slightly louder and more annoying (to me anyway).  I changed the sound back to the default through Sounds And Audio Devices and things were fine, but after starting my computer again the next day, the sound changed again.  This continued to happen every time I turned my computer back on.  Annoyed, I GOT rid of the start.wav file, but now when I turn my computer on, I just get SILENCE instead of the default Start Navigation sound.  The default sound still exists, as does the sound scheme (and it isn't changing to another sound scheme), so I don't understand what's going on here.  I tried using the Restore Default Sounds registry edit from Kelly's Korner, but it didn't change anything.  Does anybody have any idea what might be going on and how I can fix it?  If it's of any relevance, I'm on Windows XP with a Gateway GM5094E.  Thank you.Are you the only user of this machine ? ?

patio.  8-)Yes, I'm the only person with access to this computer.Go to Start / Run and type in sfc /scannow and hit Enter...have your XP CD handy.Actually, my problem has magically been solved.  Well, not magically, of course.  In the process of trying to fix another problem, the problem with my default sounds was fixed.  I think maybe it had to do with a small virus or a corrupt file.  I'm really not sure.  All I know is that I no longer have to worry about this annoyance.  Thank you for your assistance, though.