It would be a codec issue...

Try installing the VLC media player, it has all the codecs pre-installed and can play just about all files...
VLC media player - Overview

Get this pac also...
For XP this codec pac is very good
Download XP Codec Pack 2.0.8 - XP Codec Pack is one of the most complete codec pack

__________________


If you dont live for something...
You die for nothing...