LogonUI.exe - Application Error when entering wrong User password


New Member
Basically whenever I enter the wrong password on startup I'm greeted with this error and I do not know what would cause this:

LogonUI.exe - Application Error

The instruction at 0x00007FF80BA7C0DF referenced memory at 0x0000000000000000. The memory could not be read.

Click on OK to terminate the program.

Is there a service/component I might have disabled that would cause this? Furthermore I can't seem to be able to get into the Safe Boot screen when you Shift-Click Restart on the start menu. Before changing some things I was just greeted with a blank screen, now it seems to just crash-restart the PC entirely.

Any help would be massively appreciated as I can only test so many different things per day due to long .ISO creation times.

Thank you for your time.