No video playback on Windows 8 Pro

[AWS]

I'm trying to play vídeos on my Windows 8 and all I can see is a black screen and I can only hear the sound.
This happens everywhere. Youtube, video apps, media player. I can't understand why.


I've installed already the K-Lite Codec pack and I've upgraded my AMD video card. But still no luck.
Only sound , no video.
Also, if it helps, I have a Vaio J Series (all-in-one) also know as VPCJ215FB.
Could you please help me?

Thanks in advance


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