Avi Preview And Loss Of Files

ok this has happened to me a few times now and i wonder if anyone else has had similar

i had a few movies downloading and my d/l was maxed out so i thought i would watch a bit of one of the d/l with avi preview

one of the movies i was downloading had about 50 meg to go so i thought np

was watchin the movie with avi preview and all of a sudden me pc locks up

had to restart and when i did and restarted kazaa i noticed that the movie that had finished ( i presume ) had dissapeared???

now im pretty good at comp stuff, but i couldnt find that file anywhere, even used all sorts of get back restore tools ect to no avail

so it seems that a bug in the avi preview window has something to do with it maybe

cant tell u more than that as it hard locked up and debug didnt drop a file for me to figure out why

windows xp, 3 gig ram , saphire 9800xt, pent 2.8

maybe someone knows a fix , thanks