Windows Explorer didn't open AT ALL. Whenever I tried to open it (including configurations), it crashed. I rebooted. Nothing happened. I opened the Control Panel and tried to restore to a previous restauration point (which I had saved not so long ago), and it said restorations had not been activated (???). I I googled to see if there was any explanation out there and tried many different things. I managed to open cmd/shell as an admin, I ran a SFC and a DISM scan (nothing wrong was found). I coudn't even try to open troubleshooter because there was an error (File system error -2147219196). And I couldn't find any answer to it online.