Cannot finish Read & Run

I'm working on a computer that appears to have been infected with multiple trojans/viruses or other critters. I got to the SAS step and it found 4 (I think) things. When I rebooted, it got the the 'applying personal settings' step, then logged itself off and went back to the login prompt. I then tried to boot into safe mode and got a BSOD with this code - STOP: 0x0000007B (0xF7A2C528, 0xC0000034, 0x00000000, 0x00000000).
I've tried logging on as administrator with the same results.

Any help would be greatly appreciated.

 

Thanks Kestrel.

The computer is running XP Pro, SP3. As I said before, it won't finish booting. In last known good configuration, it gets to the login screen, says loading personal settings, applying personal settings and immediately jumps to logging off and closing network connections and finally back to the login screen. When I try to boot into safe mode I get the BSOD as described below, except the code has changed to 0xF79EC528 (originally 0xF7A2C528). I'm not sure at what point this change occurred. I've tried this multiple times and just noticed the difference.
Any suggestions?

 

Yea, I've worked on machines like that. You complete one or two scans and the whole thing just goes to hell. Hopefully the data is backed-up, or unneeded.

Have you got an install or recovery disk? If yes, you can try a repair which MIGHT fix enough to run the R&R steps. You may have to set the bios, usually F2 on boot, to boot from CD/DVD drive. But b/4 you do that, can you boot into safe mode with DOS prompt? Or any of the other selections you are given under F8. Try them all, you never know.
Good luck and following seas.

 

Booting into safe mode with or without networking or with command prompt all yield the same BSOD.

Booting normally or using last known good configuration gets the loop where it logs itself off after a split second.

I do have the install disk. I booted from it and ran chkdsk /f and it said it repaired some things, but results are the same. Should I try that again?

 

Well, I tried that but got stuck in the middle of it. I did part 1. In part 2 there are no system restore folders within the System Volume Information folder. I checked System Restore and the only restore point that it shows is from today when I started System Restore.

It will reboot now and has reverted to SP1. All the user's data seems to be there but he is no longer listed as a user. The only account is administrator.

 

CCleaner will run, but none of the others will. SAS causes a reboot. MalwareBytes has a runtime error. Combofix and MGTools won't load at all. I'm afraid that stopping in the middle of the registry repair may have me at a standstill. Should I roll the original files back to my system and see what happens? Perhaps one at a time, rebooting as I go?

If it weren't for 2 specific data files he needs, I'd wipe it and reinstall Windows. The problem is that I've lost use of both USB and the CD drive and cannot get the files off.