Windows Explorer is Dead in Windows 11. How to Restart it.

Windows Explorer is dead. You cannot open the Taskbar, switch workspace or even summon an open application but the mouse is responsive.

This worked for me:

Press Ctrl + Shift + ESC to open the Task Manager.

You can now restart Windows Explorer clicking: Run new task (top left) and then typing: explorer.

That should do it!

Windows Taskbar Does Not Hide

Sometimes even if you configured the taskbar to hide itself, it won't and you tried everything you know.
Welcome to the Windows way of doing things!
There is probably a notification from some process, which you cannot easily spot.
The quick way to solve this: kill and restart the file explorer.

Go to the Task Manager --> Processes, and kill explorer.exe.
Then File --> New Task (Run) and type explorer.exe.
Done!

Windows 7 Taskbar Icons Not Displaying Properly After Repair

If some of your icons display like empty boxes after a repair to the system because of some reset, then follow these instructions. They worked for me.

1. Open the task manager in the processes tab.
2. Kill explorer.exe.
3. From the File menu in the task manager, choose New task (run...)
4. Execute the following:  
1. cmd /c del %userprofile%\AppData\Local\IconCache.db /a
5. And restart explorer running: 
1. explorer.exe

Everything should be fine now!
Tested on Windows 7

Thanks to bhadri.