Using Driver Sweeper will remove all driver files. Some times when installing new drivers over old ones the files don't copy over correctly. Driver Sweeper makes sure no old files are left behind before you install the new driver.
I don't know about nVidia/ATI having better OpenGL support than the other, they both should be able to handle API calls. It's thier implimentation that may be different. Since other OpenGL games and apps I use don't suffer from the same artifact problems, I'm putting it down to the current IL-2 graphics engine not being compatible with the newer cards, not the other way round.
Either way SoW will change that.
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