If you've found errors using memtest86 then you just can't ignore them. Something is causing those errors to occur and may or may not be related to your bsod issue. Either way it has to be investigated if only to rule it out. Try testing each module individually and in different slots.
Also if notice the errors occurred on test 2. I'm pretty sure each test is different and tests the RAM in a different way. So one could surmise that every time your machine replicates the same scenario as given in test two your machine blue screens?.. Food for thought anyway.
The last two dumps sent were, as you said, pointing to the gpu driver as the issue. You could try uninstalling the gpu driver using this app which also removes old bits of driver...