Note: If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem.
Given only what you told I'm not sure which it could be. I can't tell if the next link applies to your machine:
That issue will cause such a complaint.
I have been using a laptop for watching DVD's this year the video was fine but the audio was distorted. CD,s play fine as well as stored video clips. Does this sound like hardware, software or maybe a virus. Thanks BD