media player sometimes plays but another time it will not?

Question

Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.

Answer 1

What Was You Trying To Play Music Or Movies?

For Movies Download A New Codec, http://divx.com
For Music Update Your Windows Media Player

Answer 2

if you were trying to play a movie download vlc media player it is free and you do not need codecs fot it it will play any file you download