If, by chance, these are videos with sound, you may have offered a good clue by mentioning that the sound device was lost. I wonder if you didn't delete the driver. If so, getting that back might go a long way toward solving this problem. Do you know what kind of sound device you have...or had?
I have win XP. I have an old tower of a computer. I did a defrag, cleared internet history, removed unused programs to make it run faster. I accomplished that although when I download something it will not RUN. I also lost my sound device.
I am a self taught novice and was a bit over zealous. Does anyone out there have any advice???
Thanks in advance