Strange glitch?..

When I view video content, not always, but most of the time I get this type of screen:

Sometimes it's not like that exactly, like sometimes when something on the screen moves fast, remnants of where the image used to be are still there. Hard to explain..

It doesn't happen on youtube often, mainly other websites. any ideas?

my specs:

Make sure that both your video card drive and Flash are updated. If that doesn't fix it then try turning off hardware acceleration in Flash,

Adobe - Flash Player : Help - Display Settings

Take your pick as to whether it is the video card or Flash itself that is the problem. It isn't card specific as it can happen on any make of video card.