Roll Back Windows 10 Using Command Prompt. As there are two solutions listed below, start with the first, then work your way on to the second.
Instead, you’ll be rolled back the previous version of Windows. Unfortunately, you won’t be able to fix this issue and stay on the updated version 1803. How Do You Fix Windows 10 Stuck On a Blank Screen After Updating to Windows v1803? So follow along as this article guides you through the process. Unlike the first error though, the second one can usually be fixed without a clean installation of Windows.
However, as most people get the update automatically, the chances of removing Avast are slim to none. The second error is generally caused by Avast antivirus and can be avoided by uninstalling Avast before updating to v1803.