This seems to be the case for Win installations on SSD and Apps on a regular hard disk.
This situation will not occur if you start Windows using safe mode.
Microsoft also describes how you can reverse the Windows 10 upgrade to avoid the problem
Installation of the Anniversary Update does include the ability to "go back" or return to the previous version of Windows within 10 days of the update. If you are unable to log into Windows 10 and choose to uninstall the Anniversary Update, here are two methods that can be used: