Well??? What's your GPU
all the numbers you've mentioned are different....... 5780,6870,5870??????????
well considering the 6000 series have only been announced, but nothing is on the market yet... im QUITE sure that this is about a 5870.
use driver sweeper to clean out the old drivers in safe mode:http://www.guru3d.com/category/driversweeper/
and then install the latest drivers as normally.
Should solve your problem... usually does.
Tell us if it doesnt