Unity Editor Welcome Screen Bug/Error

Hello,i upgraded my unity . it worked for 1 month,and then this error apeared.i reinstalled . it fixed.but when i restart my pc,it apears again.how can i fix it?

Edit;

Editor logs:

 Editor.log;
 
 LICENSE SYSTEM [2015625 12:44:2] No start/stop license dates set
 a
 LICENSE SYSTEM [2015625 12:44:2] Next license update check is after 2015-06-23T13:44:18
 
 Built from '5.1/release' branch; Version is '5.1.1f1 (2046fc06d4d8) revision 2115324'; Using compiler version '160040219'
 OS: 'Windows 7 Service Pack 1 (6.1.7601) 64bit' Language: 'tr' Physical Memory: 2047 MB
 BatchMode: 0, IsHumanControllingUs: 1, StartBugReporterOnCrash: 1, Is64bit: 1, IsPro: 0
 Initialize mono
 Mono path[0] = 'D:/Unity/Editor/Data/Managed'
 Mono path[1] = 'D:/Unity/Editor/Data/Mono/lib/mono/2.0'
 Mono path[2] = 'D:/Unity/Editor/Data/UnityScript'
 Mono config path = 'D:/Unity/Editor/Data/Mono/etc'
 Using monoOptions --debugger-agent=transport=dt_socket,embedding=1,defer=y
 IsTimeToCheckForNewEditor: Update time 1435228935 current 1435225442
 [CEF] SyntaxError: Unexpected identifier
     at eval (native)
     at file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:339:22
     at Function.jQuery.extend.globalEval (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:340:7)
     at jQuery.fn.extend.domManip (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:5931:16)
     at jQuery.fn.extend.append (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:5704:15)
     at null.<anonymous> (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:5830:18)
     at jQuery.access (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:4108:8)
     at jQuery.fn.extend.html (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:5794:10)
     at removePatch [as html] (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/angular/angular.js:2259:25)
     at file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/angular/angular.js:6794:26 in file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/angular/angular.js at line 9937

 Editor-prev.log
 
 
 LICENSE SYSTEM [2015625 12:42:11] No start/stop license dates set
 
 LICENSE SYSTEM [2015625 12:42:11] Next license update check is after 2015-06-23T13:44:18
 
 Built from '5.1/release' branch; Version is '5.1.1f1 (2046fc06d4d8) revision 2115324'; Using compiler version '160040219'
 OS: 'Windows 7 Service Pack 1 (6.1.7601) 64bit' Language: 'tr' Physical Memory: 2047 MB
 BatchMode: 0, IsHumanControllingUs: 1, StartBugReporterOnCrash: 1, Is64bit: 1, IsPro: 0
 Initialize mono
 Mono path[0] = 'D:/Unity/Editor/Data/Managed'
 Mono path[1] = 'D:/Unity/Editor/Data/Mono/lib/mono/2.0'
 Mono path[2] = 'D:/Unity/Editor/Data/UnityScript'
 Mono config path = 'D:/Unity/Editor/Data/Mono/etc'
 Using monoOptions --debugger-agent=transport=dt_socket,embedding=1,defer=y
 IsTimeToCheckForNewEditor: Update time 1435223829 current 1435225331
 [CEF] SyntaxError: Unexpected identifier
     at eval (native)
     at file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:339:22
     at Function.jQuery.extend.globalEval (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:340:7)
     at jQuery.fn.extend.domManip (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:5931:16)
     at jQuery.fn.extend.append (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:5704:15)
     at null.<anonymous> (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:5830:18)
     at jQuery.access (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:4108:8)
     at jQuery.fn.extend.html (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/jquery/jquery.js:5794:10)
     at removePatch [as html] (file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/angular/angular.js:2259:25)
     at file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/angular/angular.js:6794:26 in file:///D%3A%2FUnity%2FEditor%2FData%2FResources%2FHome/ext/angular/angular.js at line 9937
 EditorUpdateCheck: Response {updateinterval: '3600'} updateurl =  interval = 3600