xp immediately logs off after trying to log on

I have a customers computer that was running very slowly. Turns out they had out of date antivirus and no spyware protection. I installed AVG and cleaned it from viruses. I installed and ran Ccleaner, Spybot S&D, Spyware Blaster, Spyware Doctor, Combpfix, and MGtools. There was a major spyware infestation and I ran the tools for removing CWSearch, Virtumonde, and smitfraud. I removed all the spyware, Ran second checks with AVG and the antispyware programs and the system came back clean. I had been restarting it after I ran each check. Restarted it one last time and now I when I try to log on it says it is loading settings and then immediately logs off. I searched through the forums and found several related posts. Tried the fix of renaming userinit.exe to wsaupdater.exe. Tried the fix in Micorosft knowledge base article 307545. I've tried doing the repair from the XP CD. I've tried doing chkdsk but nothing seems to work.
What else can I do?

 

I meant the screen after you press f8 to accept the license. It then says it's searching for a copy of Windows XP. Then it it says to to repair the Windows XP installation press R. I've done that a couple of times and still get the same problem.
Any ideas, suggestions, etc.?