Windows crashes when i play avi files

I played avi files all the time now suddenley when i try to play one in various players it comes up with an error and restarts windows explorer,even if i just open a folder with an avi file in it still restarts explorer,i have diabled DEP but it made no difference,can anybody help, I am running Winxp pro.The strange thing is i can play dvd files with no problem.

It sounds to me like that avi file in question is corrupted. Get Gspot and see what it tells you about the file.