Sir u gave answer to this topic,your answer starts with holding ctrl+shift+esc but a pop up came telling that task manager is disabled by administrator,I Even tried ctrl+alt+delete but there is no files option to go forward through one of your solution,plz help me out of this nightmare
Using Task Manager is a good idea, because you may need to restart the explorer.exe process. If the Task Manager is not accessible, you may need to make sure you are using the PC as an Administrator. If so, please try booting in Safe Mode. The same issue appears?
Have you been using multiple displays recently?
There may be a problem with the booting of Windows. In that case reinstalling the OS may be a good solution. Is that an option?