Startup is just black! (log file attached)

I installed unity and when i run it the startup screen appears just black. I tried solutions about package files but not worked. PLS HELP ME. here is my log file.

Built from '5.5/release' branch; Version is '5.5.0f2 (1c3fa4a7f523) revision 1851300'; Using compiler version '160040219' OS: 'Windows 7 (6.1.7600) 64bit' Language: 'en' Physical Memory: 3894 MB BatchMode: 0, IsHumanControllingUs: 1, StartBugReporterOnCrash: 1, Is64bit: 0, IsPro: 0 Initialize mono Mono path[0] = 'C:/Program Files/Unity/Editor/Data/Managed' Mono path[1] = 'C:/Program Files/Unity/Editor/Data/Mono/lib/mono/2.0' Mono path[2] = 'C:/Program Files/Unity/Editor/Data/UnityScript' Mono config path = 'C:/Program Files/Unity/Editor/Data/Mono/etc' Using monoOptions --debugger-agent=transport=dt_socket,embedding=1,defer=y,address=0.0.0.0:56548