windows xp

limewire 4.9.29

hello i wonder if anyone out there can help me in the last couple of months being with limewire. i have downloaded a couple of avi video files that when try to play them backthe picture pixelates and has discolouration. this only seems to happen on avi files.

i have download TMPGEnc 2.5 file convertor but on some of the files when i try to use this convertor it displays a message which is the file name followed by cannot open or unsupported

is there any way around this

any suggestions please

thanks

DM