AFFECTS ALL VERSIONS
Whenever I launch Minecraft, any version, I get a flash of the Minecraft splash screen then it goes black.  My friend pressed F11 and I told him not to but he did anyway.  Now my Minecraft installation is stuck in fullscreen.  I have uninstalled as through Settings and Control Panel then reinstalled several times.  Nothing changed as I tried all of the versions again, didn't crash on F3 + C command. Then I uninstalled it and searched my C: drive for any remnants of Minecraft and deleted them, then reinstalling Minecraft.  Still stuck in fullscreen mode and it is black, did F3 + C and it didn't crash. When I try to close Minecraft in Task Manager, all I get is a "(Not Responding)" extension of the name. When Windows pops up to say it's not responding, I click the end button. It doesn't end the task. As far as I can tell, the only option to close Minecraft is to restart my computer because Windows Command Prompt, Windows Powershell, Git Bash, and Git CMD (different console terminal programs I have) all don't open on the top of the window. Any help is appreciated!