When you logon, the splash screen shows a logging in splash, plays the logon sound and then the splash says saving user information and logs you right back out again.
I've tried with every logon to the machine - Local user, local Administrator, domain Administrator - I fear all I have done is given all of my passwords to a keylogger.
I've followed the instructions in the post: 20552-1 (XP Pro logs off immediately after you log in) and best that I can tell is that this is a new variant of that issue.
That post had me do the following:
Open the registry remotely from a different machine
Navigate to: "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon"
change the current value to "C:\WINDOWS\system32\userinit.exe,"
NOTE: The value was set to: "C:\WINDOWS\system32\scmss.exe -Service" which best from what I can tell is a trojan. This did not work.
Later in the post, it suggested copying userinit.exe to wsaupdater.exe, this did not work.
Also suggested copying from another computer with same windows version... I did this through the repair console (DOS prompt) and this did not work (and it was from another computer that was identical when it was originally installed).
Did a complete repair through Windows installer, still no joy.
I'm at a complete loss and I think there are a good number of folks experiencing the same issue.