The only option is to click OK.
The same error is shown again, but titled: "lsass.exe"
Again the only option available is an OK button.
A 3rd box appears titled: "User Interface Failure" and contains the following: "The Logon User Interface DLL msgina.dll failed to load. Contact your sys admin etc etc"
The only option is a button labelled restart, which leads me back to the start, ad infinitum...
I do not have an XP "install/boot" CD, and the machine cannot be booted in safe mode, the same errors appear, and the last known configuration does not work either.
Any suggestions on accessing the machine to replace the necessary corrupt files, and which files need replacing, and the best place to find these files.
Any help would be much appreciated.