When Windows 7/10 starts and when the desktop should load, you encounter the following error message:

 The User Profile Service service failed the logon.
 User profile cannot be loaded.


In System and Application Events, you may notice the following warnings and errors:

Application (Error):
Windows cannot log you on because your profile cannot be loaded. 
Check that you are connected to the network, and that your network is functioning correctly. 

DETAIL - The system cannot find the file specified.
Application (Warning):
Windows cannot copy file \\?\C:\Users\Default\AppData\Roaming\Microsoft\Software Center\.cache to location \\?\C:\Users\TEMP\AppData\Roaming\Microsoft\Software Center\.cache. 
This error may be caused by network problems or insufficient security rights. 

DETAIL - Access is denied.


To resolve this issue, you should add read access to the following directory for the Users group:

\\?\C:\Users\Default\AppData\Roaming\Microsoft\Software Center\.cache
For example like this: 

Application (Avertissement):