This document describes how to troubleshoot installed video and audio codecs on Windows 7 and Vista.
Codecs are software components that define the methods that applications use during encoding to compress media files, such as songs or movies. Applications also use codecs to decompress encoded media files during playback.
Several codecs are included with Windows 7 and Vista. These codecs are unlikely to cause problems in Adobe applications.
Additional codecs can be installed on the computer to add support for more types of media files. (For example, codecs can be downloaded from the Internet to install, or applications installed on the computer can add codecs to the computer.) Poorly written, damaged, or incompatible codecs can cause problems in Adobe video and audio applications, Adobe Photoshop, Photoshop Extended, and Photoshop Elements.
Adobe applications load codecs from different sources, and this document has separate sections for troubleshooting each of the sources that are most likely to cause problems. It's possible that some of the sections don't apply to the problem that you are troubleshooting.