Try using the Recovery Console to replace system32\logonui.exe. If you have updated to SP3 then the latest version will be found in Windows\ServicePackFiles\i386 folder.
michael2093870 commented: Terrific! Entertainingly informative. Now I'll look for that marvelous fix Gerbil describes. Happy Sunday Gerbilness! +0
gerbil 216 Industrious Poster
gerbil 216 Industrious Poster