ya u can directly change the audio track in use...different methods in different softwares, but usually just right click on the screen and look for audio options
there, select ENGLISH most prob it will be the first one, but u can try all the tracks one by one till u get it rite
im assuming ur trying in a computer
even wen u copy 2 ur HDD...in the dvd ripping software choose a different audio track until u get it right
also, check on the dvd...maybe they made it wid commentary only for sum special reason and they dont have a non commentary version on that dvd
and finally, if its pirated, the guy who copied it must hav selected the wrong track while burning it so he burnt the audio track with the commentary by msitake...then u cant do anything about it