i Have the same problem. I cant preview any video files even the ones i have downloaded already. But i can listen and preview music just fine? i need some help here. thanks

Don't bother trying to contact LW tech support, I got some A-Hole who kept whinning because I didn't give him an 'error message' Theres no error messages, it just doesn't work.. His fix??? 'just go to your shared folder and launch the songs/videos from there'

Gotta love it

The Limewire player can preview and play only music files. For videos it usually chooses your default player. It somtimes happens that your default player has an codecs issue with certain file. That's why we here recommend to use the free VLC player with built-in codecs, which can play almost all media files. You can download it here and give it a try:
http://www.videolan.org/vlc/

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"

my default player for video and mp3 is my windows media player that works fine, just not from LW..
and it did work untill the last version