What Media Player are you using?? The LW Player won't play Videos AFAIK.
May need to Dump LW's Player altogether as it is not very good and use something that really works.
Try VLC Media Player in this Link.
There are several to choose from in this link though.
CODECs list for Movies/Audio/ Alternate players / Video help forums/ video-mp3 fixers
Hope this Helps.
