AVI and MPG are the onley ones that you should Dl movies as ....WMV is allmoast allways a stupid ad or contains a virrus or is fake.

the movie you dled may be corrupted or you may just not have finished the dl and it is onley playing the portion you have dled and thus stoping 3/4 the way thru

or you may have gotten an mpaa fake file that porpusley had the end cut off to try to make you buy the movie to see the end.

try playing the file with VLC player and see if the end is there...maybe WMP is choking on a spot in the video...

and no you dont need any more software to DL mpg movies (possibley CODECS but there EZ to find/install).