It would be good to know what type of movie you have, what your converting it with and to what. Help us so we can help you.
The JPG you attached indicates your using VirtualDUB and a drive letter of T: so possible across a network.
Downloaded DivX movies are all full of problems, many introduced by using crappy download managers. The program DivFix can generally fix these problems (d/l from _www.doom9.net )