Originally Posted by
kgiaq007
...it plays fine but there is no sound. I know the second has working sound because other files play fine.
The second computer may be missing the audio
codec used by the video. A codec is small chunk of software that enables the audio system to correctly interpret the audio data present in the video. A codec utility, such as
GSpot or
MediaInfo will reveal which codec the video used, which can then be obtained. Might try transferring it to the second computer with a USB flash memory drive just to eliminate email having any impact on the original file.