You can turn off the graphics processor by manually editing the LR prefs file as shown here:
Graphic card doesn't make a difference with lightroom? Is there any way to fix the problem instead of turning it off ?
Some cards and some graphics drivers just don't work properly, so the best thing to do is to turn off the GPU acceleration.
New beta driver supposedly fixes the problem. I haven't tried it yet but I am using an older driver which doesn't crash.
-  Adobe® Lightroom may crash if GPU rendering is enabled