black screen and serious performance issue

 
 
an error has occurred,performance problem and the screen is black,the performance as they will see low at 4 and the anes version had it at 120 fps, and when you load some of my maps you see nothing but black
 
resources of my pc when i pass:
1-4 gb of ram
2-processor adm 3.20 GHz
3-2 GB of graphics nVIDIA Geforce Gt730 Dual VGA + hdmi