I don't see the machine make or model but there was/is an issue that is easily cured by updating the machine's audio driver.
-> After that, I always try VLC PLAYER.
I am not being mean here, but since you didn't tell the make, model number and such I am left to think you don't need help finding this driver?
all of a sudden i can no longer play dvds on my computer. i have tried several new store purchased copies, running right after start-up with nothing running in the background and different programs. all the results are the same, it almost seems like the videos are running at 1/2 speed which they are not in the controls. no other video does this except dvds. i have no spyware, etc. that i am aware of and the computer runs flawlessly with no other issues. i went into the advanced settings of the drive(s) and one selection had pio instead of dma, i changed that around and also have installed the lite codecs just to make sure and it still has the same jerky playback of both video and audio. could this be a bad drive or dirty lense?