Garbled video and display

Sometimes after I use my computer it begins to get this garbled video on screen:
The above picture is just an example. It gets worse though... certain things that require alpha blending (like when the brightness/volume bezels fade out) or even simple things (like scrolling certain windows) makes the video all garbled. Scroll bars will flicker when scrolling. Only happens sometimes and in certain windows.
I have a feeling it's the graphics card, but could it be something simpler to fix, like some corrupt background app?
Anybody seen anything like this?

Anybody?

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