I too have a dvd camcorder, and I know your pain.

Ive been fortunate not to have this exact problem, but my sonic udf reader (I believe sony bought sonic?) screws up ALOT. I was in the pattern of uninstalling all of sonys software that cam with my camcorder, going to program files and deleting the sonic folder. Than when I reinstalled it would work for a short time again.
However now I just import my video files off dvds with Nero. If you dont have nero, try and find another program that will import video from your camera.
I dont know if this will help at all

. Ive just turned to other software to do sonys work.