mpg and avi files did not play correctly

[ci_ci]

:wave: Hello, I just downloaded two video files from Limewire. One is in mpg file, another one is avi file. In windows media player, it seems "playing", but it does not have sound and pictures (So, it is just blank black.). However, the seek bar is moving. So, i don't know what is going on.

Can anyone please help~, thanks!! ;)

Ci Ci