Found it in the tracker, we got that on the fujitsu's with nvidia cards, not the dells. Hate those anoying things, are you deployng same software on every computer, would sugest to do a clean boot disable all the possible to run from boot and check if the machine will log without problems and step up to find the problematic aplication. 2020-3-26  LogonUI.exe is a Windows program which is responsible for the interface you see on the login screen. It allows a PC to start only when a user enters the correct password and account username.

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The LogonUI.exe is an executable file which is used by the Microsoft Logon User Interface, which is a process related to the Windows XP user switching screen.