Windows logs on then immediately logs off

This article saved my life today:

http://support.microsoft.com/kb/555648/en-us

The path to userinit.exe was doubled up with a path to an MS update as well. Luckily this only screwed up one account. Here are the notes:

Note: Don’t change the drive letter to X – Keep it whatever it is (most likely C:)

Edit these values and type the correct path of shell :

Shell = explorer.exe
Userinit=X:\windows\system32\userinit.exe

NOTE: These files may also be deleted by spywares. You may need to extract them using Windows CD.

Steps for rectifying this problem: 

• Log on to a networked computer.
• Run Regedit.exe
• Point your cursor to HKEY_LOCAL_MACHINE
• Select File > Connect Remote Registry
• Type computer name (infected computer)
• Navigate to the following location in registry of destination or infected computer

HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon

• Edit these two values in right pane:

Shell
Userinit

• Change these two values to

Shell=explorer.exe
Userinit = x:\windows\system32\userinit.exe

• Exit from Registry
• Restart Infected computer.
• You should be able to log on to computer.