Video/Audio problem with iTunes/Windows Media/VLC

#1
Hey guys this is a new problem that just started yesterday, I Downloaded a codec pack because I wasnt able to view some old tutorial recordings i made with Camtasia a while back and since then whenever I open any program like Windows Media player, Windows Movie maker, iTunes, VLC players or anything to do with Videos/Audio/Webcam it will crash and i get messages in the attached files as soon as they open so I'm unable to use them at all.

I've tried searching for other answers and have had no luck :(


P.S this also includes Windows live Messenger, which i just tried opening.
 


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