windows 8 pro video not playing

[AWS]

I'm trying to play videos on my Windows 8 and all I can see is a black screen and I can only hear the sound.
This happens when i watch video from my hard drive.but if i watch any video on Mozilla Firefox that's works fine. 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 LAPTOP MODEL VPCEB1S0E.
Could you please help me?
Thanks in advance

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