If when you try to start your Windows 10/8/7 computer, the computer stops at the logon process and you are unable to proceed further – then this article may interest you.
Logon Process Initialization Failure
Not only will your logon process not start, but in addition, you may also receive the following error message:
Interactive logon process initialization has failed, Please consult the event log for more details.
This issue could occur when you use the automatic logon feature.
You can try to restart your computer and see if you can recover from this issue.
If you need to view the Event Logs, you can try our Windows Event Viewer Plus, a portable freeware app that lets you view Event Logs faster than the default in-built Windows Event Viewer and do more with them.
You may also try to restore the LogonUI file.
If nothing works for you, Windows 10 users may have to consider running Automatic Startup Repair.
If you are a Windows 7 user, you can request and download Hotfix 379793 at KB2615701 and apply it.
The hotfix is meant for Windows 7 and Windows Server 2008 R2 operating systems.
Hope something helps!
Read here about the LogonUI.exe Application error on startup in Windows 10.