Windows7 use video playback software when prompted no decoder is what's going on

When you play video on a daily basis, you sometimes encounter problems playing a video prompt without an audio or video decoder (pictured above), which is because we use the playback software or the system, there is no corresponding decoder for the video file, resulting in video or audio can not play, at this time, We need to download the corresponding decoder or replace the other can support a variety of decoding format of the playback software, to solve such problems (such as Storm Audio, thunder look, etc.).