Unity5 crash on startup

I do not understand what the problem is. Errors started from scratch . At first I was a version 5.1.0f3 on it and started this error , I updated to 5.1.1f1. This version worked one day , and then the problems started. I've already tried to reinstall , but it did not help . I attach a piece of log . Later I noticed that the problem may lie in the fact that knocked file associations unity3d. the entire log: http://pastebin.com/rjwrWWGS Please help me

 LICENSE SYSTEM [201572 14:58:41] Next license update check is after 2015-06-15T15:45:46
 
 Built from '5.1/release' branch; Version is '5.1.1f1 (2046fc06d4d8) revision 2115324'; Using compiler version '160040219'
 OS: 'Windows 7  (6.1.7600) 64bit' Language: 'ru' Physical Memory: 11461 MB
 BatchMode: 0, IsHumanControllingUs: 1, StartBugReporterOnCrash: 1, Is64bit: 1, 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
 IsTimeToCheckForNewEditor: Update time 1435678804 current 1435809521
 Crash!!!
 SymInit: Symbol-SearchPath: 'C:/Program Files/Unity/Editor/Data/MonoEmbedRuntime;.;C:\Program Files\Unity\Editor;C:\Program Files\Unity\Editor;C:\WINDOWS;C:\WINDOWS\system32;SRV*C:\websymbols*http://msdl.microsoft.com/download/symbols;', symOptions: 530, UserName: 'Артём'
 OS-Version: 6.1.7600 () 0x300-0x1

[1]: /storage/temp/49317-сохраненное-изображение-2015-7-2-15-15-31244.jpg