Ok this is the case. Yesterday I tried to install theme in unfortunately i didnt make the backup of explorer.exe And the tool i used for Theme Installer for Window. That is available across internet and widely used. I always make the backup of the files which are patched.
Now whenever I try to start windows it says that explorer.exe is not starting. But windows automatically make a backup of Explorer.exe and name something explorer-back.exe. So i renamed the backup explorer to explorer.exe and restarted the windows but it is not working.
Any idea how to solve this issue. Please note Explorer is not running means NO GUI only thing is working is Task Manager and I can run cmd in NORMAL USER MODE