well i hope this goes here. it is a computer problem

i noticed a month back that the audio no longer played on my dvds burned or pro, using any dvd player software ,although i normally use media player.

now i just bought a book that came with a dvd-rom i inserted and clicked to play in media player and it froze! i opened in premiere (its a 720x480 avi) and it played skippy and i opened with real and it also played skippy.
i ran tests on the avi with avi codec and it said i was missing sony dv codec. , i couldnt find it anywhere!

so anyway i attempted to dlaod a few free dv codecs and panasonic seemed to make my video play smooth in real and premiere but mediaplayer still freezes and still no audio on any dvds!

ive spent all night on this and i dont want to install every codec on the net unless i know what its doing. any suggestions would be very appreciated