K-Lite (Mega) Codec Pack is a collection of audio and video components for Microsoft Windows that enables the operating system and its software to play back various audio and video formats generally not supported by the operating system itself. K-Lite Codec Pack also includes several related tools, including Media Player Classic, GSpot Codec Information Appliance and Codec Tweak Tool.
Alot of audio and video playback problems I have had in the past, I normally resolve alot of these by installing the latest

K-lite Codec Pack.