If you are running Win2000 or XP try this first: [red](Not compatible with Vista) [/red]
Download [b]SDFix[/b] "http://downloads.andymanchesta.com/RemovalTools/SDFix.exe" and save it to your deskto ...
I have the same problem. Everytime, I delete this WLctrl32.dll from system32 folder, and from the registry the entry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify ...