Have you tried exporting without using minify?
Also try without png recompression.
You say it isn't the gfx card, but you haven't given any details about the card. What model is it? How much on-board RAM does it have?
As I said previously, exporting without minify and png recompression works for me. If it still doesn't for you, then its more than likely something on your PC end that's the problem.
Another person trying this would be helpful (come on guys!) :)