Usually press the start button and press the F11 button, depending on the OEM quotient. To restore the system to its previous state, follow the following steps: However, recovery works only if you do not delete windows. If you also encounter black screen problems, you need to go into security mode and restore to installation updates, or downgrade to Windows 10 Creator Updates Autumn Edition. Now some netizens feedback in Microsoft Forum, after installing the patch, PC encounters black screen. On May 9, Microsoft today pushed the April version of KB4103721, Windows 10 Build 17134.48.