XP logs off user right after logging in?

As soon as my nieghbor logs into her XP comuter, it logs her back off.
I'm thinking it's a virus, but I can't log in to safe mode or safe mode with command prompt or nothing.
Any ideas?
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moodjbowConnect With a Mentor Commented:
I had recently a problem with the same symptoms after an antivirus program quarantined a file (yes it was a virus) that has nested itself "inside" the userinit logon.
Just check the two places:
there you should have a value REG_SZ named Userinit as C:\Windows\system32\userinit.exe,
yes with the comma at the end.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Image File Execution Options\userinit.exe\
there ít is possible to find a value named Debugger pointing to an exe file - in my case this was the pointer to the quarantined virus.
PS: Since you cannot run regedit even in safe mode I would rather recommend using BartPE instead of winXP install cd' recovery console, and from there load the registry hives for HKLM
Could be a faulty driver or hardware. Did she recently install anything new?
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Try this;

hey try this
1. Boot using your winxp cd.
2. Enter recovery console.
3. at the command prompt go to
4. next type:
            copy userinit.exe wsaupdater.exe
5. exit and reboot normally. You should now be able to logon. But you're not done yet!
6. run regedit
7. find the Userinit key in:
8. modify the entry:
so that it reads:
C:\WINDOWS\System32\userinit.exe sign on sailor

quoted from:
try this
1. using rescue boot cd
2.u have to try webroot internet security or G-data internet security and repair ur registry files using Advanced System optimizer.surely it will fix it.
                             Thanks kart4578
philw3995Author Commented:
This was a little risky, but it worked!

Thanks to all of you!
Thanks for some great answers. Cant use any of them at present because I cant boot from an XP CD. Set up doesnt detect any disks on the machine - so it must use SCSI drivers we dont have. I need to go hunt for XP drivers for Fujitsu lifebook S series first.
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