Windows 7: No video playback only audio (only black screen)

Hey guys,, I have a little problem,, hope I can get my answer here.
Hey guys.
I recently desc covered that besides VLC on my laptop all the other video player are not able to work properly (meaning,, Windows Media Player 12, Cyberlink PowerDVD12 and WMPC are able to play only the audio, but not the video, just black screen),, BUT with VLC is no problem playing any video format!! The thing is that I didn't have this problem previously,, all my video players were able to play all the same video files, which they can't now!
I have the latest AMD Radeon HD video drivers installed (just after I discovered the problem).
Can anyone help me with this?
Thanks and have a nice day, hope we can resolve this. ))


I have previously made this trade in a "Graphic Cards" section,, I guess it was wrong so I am re-posting it here "Music, Pictures & Video"

what video format are you trying to play? do you use any codecs? VLC has inegrated codecs so maybe thats why you can play video on vlc.

ANY video format I am playing in ANY other video player then VLC,, is not working !I am not using any kind of codec packs ,, MAYBE they got installed with some program I have installed previously, I am not sure about that ! MPC has integrated codecs too, as I know but it doesn't work as well,, plays only the sound of the video file!
thanks for response )) an other suggestions?