I'm not familiar with dvd decorder, however two of the more popular and trusted rippers are SmartRipper and DVD Decryptor. If you are ripping your dvd's to view them directly from your HDD then I would use DVD Decryptor. It is pretty straight forward, defaults to movie files and english audio.
It depends on what program you are using. Usually, when ripping a dvd, several audio tracks can be selected. The problem is that the audio tracks are not labelled. If you can select the first one, it is usually the host language. (USUALLY!)