No video display in wmp, video app, zune on windows 8

Hello frnzz,

I have a wired problem ,

I have installed windows 8 enterprise edition on my laptop Sony Vaio VPCEB16FG.

my problem is there is no video display for any video, i get to hear only audio. on wmp, zune, and windows 8 video app.
only vlc is playing the videos fine.

Please help guys.