its not a codec issue per say. looking at the image, the little blocky things are also in your GUI panels! I think you overclocked your gfx card and failed to mention that or its a driver issue that you can roll back if your lucky.
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Well, considering that AE uses the graphics card for almost nothing (surprise!), just turn off all that acceleration stuff. It doesn't help, and it's probably hurting you.
I contacted with Nvidia support, my graphic card was crash, I must send laptop to service and replace with new card, so it's not a problem with drivers or overlocking