My pc did the latest update but now won't restart windows. I get an option to choose a keyboard then when I enter my password I get a black screen with few icons but when I click on any they don't work. I've run the troubleshooting, found no problem, I don't have a restore point available. I've done hard reboot, none of the options work and it won't go back to previous version or let me reset the pc. Help please!