Use the dos boot disk
http://home.eunet.no/~pnordahl/ntpasswd/bootdisk.html
http://www.experts-exchange.com/Operating_Systems/WinXP/Q_20972739.html
at the prompt [1020],
type cd Microsoft and hit enter,
then cd Windows NT and hit enter,
then cd CurrentVersion and hit enter,
finally cd Winlogon and hit enter (case is important).
this is where you will end up:
(notice you DO NOT ENTER HKLM nor SOFTWARE !)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
cat Userinit and lo and behold, up came
C:\WINDOWS\System32\wsaupdater.exe...
I don't know what company replaced userinit.exe with this entry, but I don't think I like them.
At any rate I typed
ed Userinit and at the prompt [C:\Windows\System32\wsaupdater.exe]
I typed C:\Windows\System32\userinit.exe and hit enter.
Then q to quit (you will be asked if there is something to save), q to keep quitting and y when it asks if you're sure you want to write the changes (careful, careful... good luck). The program then dumped me out to a # prompt and said I could rerun the script if I typed a space followed by sh /script/main.rc
I removed the cdrom from the drive and rebooted to Windows XP, no problems.
note: may do a checkdisk - let it.
