This is very strange, but for some unknown reason Windows 10 will not let me open some programs (e.g. file explorer, task manager, chrome. But, it will let me open Word, Excel and Edge. When I go to shut it down it just keeps running and running. It is almost like some App has taken over part of the system and won't let go. I have let it run for 4 hours and it never shut down. Obviously I have to disconnect the power cord and do a hard boot to get it back. Any ideas?