I'm running Lightroom CC 2015 on a Samsung laptop with an Intel core i7-2675 QM CPU. There are two video adapter cards installed, an AMD Radeon 6600M and an Intel HD Graphics 3000, both with the latest drivers. When I go to Lightroom>edit>preferences>performance, I get a message that the graphics processor has been disabled due to an error. When I then go to system info, it's apparent that Lightroom is not accessing either of these cards, because the spaces where the manufacturer, model, etc. are supposed to show are blank. Any suggestions on how to deal with this problem? Thanks for your help.