SkullKrusher.
I don't know what your problem is, but I have had no problems what so ever editing and downloading the files downloaded from my Everio MG 21 camera.
The software is a cut down version, In my case it was unable to vary the individual audio levels on each clip, but I have discovered PowerDirector 6 is the only Cyberlink software that will handle th ac3 Digital Audio files and I am considering purchasing this.
This is the first time I have edited video files and found it to be very easy to use.