unity not opening

when i open unity5.2 a message window appears with work ofline,manual activation and quit buttons on that and when i click on work ofline nothing happen unity wont open same thing with other two buttons too. can somebody help me fix this problem

Check this link: Troubleshooting common problems with Unity 5.x Editor - Unity Answers
Did you tried to reinstall Unity 5 ? and tried the lastest version of Unity 5 (witch is now: 5.3.5f1).