Want to share my experience since this issue is discussed on the internet I followed the solution I found on YouTube all offered the same solution and none work for me but..
A windows 10 machine hung on startup the window 10 startup circle stopped circling and that's it. The option to login did not shows up.
I restarted it into safe mode as soon I logged in I got the following msg “Microsoft edge can’t open with built in administrator account windows 10”
I searched on YouTube how to fix this error msg, the solutions offered was how to modify the security policy’s for the build in admin. Did not work for me.
What did work was I uninstalled the network drivers (in device manager) did a restart and the system boot was successful.
Seams that since window had an issue with the network driver it gave an error on Microsoft edge. But not sure why it include in the msg the misleading end of being relate to the built in administrator account.
Hope you may find this helpful
Exchange Administrator of a O365 tenant that is using either DirSync or AADSync are no longer supported and may not work correctly. These tools are no longer supported as of April 2017, and after December 31, 2017 O365 team are not able to guarantee your connections from Windows Azure Active Directory Synchronization (DirSync) or Azure AD Sync work properly. This may affect your ability to synchronize your local directory infrastructure with Office 365, and will result in users being unable to log in to their Office 365 services.
Azure Active Directory (AAD) Connect is the best way to connect your on-premises directory with Azure AD and Office 365. Upgrade your sync functionality to the latest version of Azure AD Connect, which is the currently supported tool for syncing data to O365 cloud features.
Yesterday was Patch Tuesday and Windows 10 V1709 DID update to 16299.371. No issue.
But if I run Updates again, all done - nothing to update.
I went to the Media Creation Link and run Upgrade this PC. That puts an icon on my desktop and it tells me I have the latest version. I did that yesterday and I have tried it every 8 hours ago and nothing.
So no V1803 yet except for Insider machines (yes, I have it installed on my insider machine).