I'd say your problem is a codec issue....
These codecs are for XP.....
Download XP Codec Pack 2.0.7.1 - XP Codec Pack is one of the most complete codec pack
You could also get the VLC media player it's free and has all the codecs pre-installed, it is one of the most reliable players out there...
VLC media player - Overview
To make the VLC media player your default player...
To make VLC your default player
Go to your shared folder (outside of Limewire) you will find this folder by clicking on one of your files in your LW library and clicking explore...
Right click on one of your movie files
Select open with
Select choose program
select VLC
and tick the box that says always use this program to open this file type
Select OK
Also Bitzi is very handy, this link will explain what it is and how to use it...
How to use Bitzi Web Lookup .. & How to use Magnet Links & Direct Connect/Browse/Chat