Register and userinit

In autoruns, during clean up, I have deactivate userinit.exe and now, when I want to login he starts but directly he gives the message "saving your settings. ".
The key who caused this problem and I have deactivated is:
HKLM\SOFTWARE\MICROSOFT\WINDOWSNT\CURRENTVERSION\WINLOGON\USERINIT and from hereon he makes a link to my startup partition E:\Windows\system32\userinit.exe
So I have no access to Windows, the same problem when I start in save mode with account administrator.
Via an extern bootable cd I can enter in my hard disk .
My question :
how to activate the key
or is there a tool to enter outside of windows in the original registry

 

Userinit.exe is critical to the successful start of XP.
Its entry should never be touched.

Do a registry repair: http://support.microsoft.com/?kbid=307545

While you could use a Bart PE CD if you make one:
http://www.nu2.nu/pebuilder/

Or to use Regedit, you can make the smaller Winbuilder instead: http://www.pchwforum.com/Winbuilder_Created_By_Nuno_Brito_help_pchelpworld-t691.html