[Frank MetaMusil]

If you've got the disc, do this:

You don't want to install a new OS, so start the repair utility.
Go through the startup sequence and you will eventually get to the C:\windows prompt. Change the directory to system32 (cd \windows\system32). At the C:\ windows\system32 prompt type
copy userinit.exe winlogon32.exe.

This replaces the missing winlogon32 file with the correct userinit file.
type EXIT
After you get the computer restarted you will still need to fix the registry problem (START RUN Regedit)
HKEY_LOCAL_MACHINE\Software\windowsNT\currentversi on\winlogon\
Just click on the winlogon folder and find the file in the window. The winlogon file needs to be set to
userinit=c:\windows\system32\userinit.exe. This will probably show up as userinit=c:\windows\system32\winlogon32.exe.