Logon fail after installing SP1

[mperkins]

I downloaded the Service Pack 1 and restarted my computer to let it install. After it rebooted, it would not let me logon. I got an error message:

LogonUI.exe - Bad Image
C:\Windows\system32\authui.dll is either not designed to run on Windows or it contains an error...

I've tried System Restore and that didn't work. Can't run in Safe Mode either.

 

[MowGreen]

Did try to do a System Restore from Startup Repair ? - How to Run a Startup Repair in Windows 7
Does the maker of the computer offer a way to return the system back to the state it was when you first booted it up ? It's not the most desired option but it does provide a way for you to log on.


Also, you can notify Microsoft about this occurrence plus they offer no-charge support for issues such as this one. There may be something "unusual" taking place that MS should be made aware of.

Start here - Microsoft Support
Pick the edition of Windows 7 that is installed.
On the next page put a mark next to " I use it for my own personal use "
On the next page click the drop down window and select ' Service Pack', then click the Continue button to initiate the Support request.