I think I am understanding that you mean to use the system restore point listed under control panel? Unfortunately, I have made additions in software and other things lately, so I'm afraid to restore and change any of those necessary utilities.
More than likely these changes recently made or a Windows update installed has caused this problem.
It is only with .dvf files, not .dss or .wav - they still play perfectly. Grrrrrr... Computers are a necessary evil. :0)
Thanks so much for responding. I hope someone has an idea of how to patch this up. I have tried everything else I can think of.