When complete, restart in normal mode, then install a compatible antivirus or enable the built-in Windows Defender.
Press the number 4 key to load Safe Mode. Click Troubleshoot > Advanced options > Startup Settings > Restart. Keep holding down the Power button while Windows 10 loads the recovery environment.
At the sign-in screen, hold down the Shift key on your keyboard, click the power button, then click Restart. Press Control + Alt + Del on your keyboard, click Sign Out. You can isolate these problems by uninstalling them, then install the latest versions. Applications and drivers such as Apple’s iCloud and IDT audio can also prevent the desktop from loading. If the Windows desktop fails to load at all, then there might be an even more complex issue such as an incompatible display driver. If you are unable to load Control Panel, try accessing the recovery environment, then boot into Safe Mode. You can also open the Run command, press Windows key + R then type: appwiz.cpl then hit Enter. If the Start menu is inaccessible after an upgrade, press Windows key + X then click Programs and Features, select your incompatible Antivirus utility then uninstall it. You can try uninstalling them, then reinstall a compatible version or switch to the built-in Windows Defender. Users have reported being unable to open the Start menu, or the desktop will flicker, antivirus utilities are notorious for this. Incompatible applications are a common reason why Windows 10 installations might be broken after upgrading.
Your computer is ready to install updates whenever the Shut Down icon displays a yellow update shield or your computer prompts you to restart to install updates. You will need to restart your computer for the updates to properly install.