No sound but good video

I backed up a movie and the video was good, but NO sound.
So I opened up some of the files Decrypter put on my hard drive, and they also have NO sound. So apparently Decrypter must be the problem. Any ideas or help would be greatly appreciated. Thanks.

Did you use stream processing to rip the .m2v out, or did you use file mode to copy the VOBs to disc? If you used stream processing the video and audio are now seperate, if you used file mode you might not have a default stream selected or the program you are using to play it back will play nothing without a default stream. Not sure just tossing ideas out there.