I have a Dell Inspiron 5555 laptop. I did a windows 10 reset because the OS was really slow and thought it would be a good thing to do as it hasn't been done in a while. Now it's boots ok. I put in the password to the account and immediately the screen goes black with the mouse cursor. I try alt+ctrl+del and then task manager but nothing happens. I read if i can get to task manager i can run explorer.exe or work with registry but I can't even get to task manager.