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bad infection, laptop won't boot!

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Hi forum,

I got infected really bad by some unknown malware.

when i boot up my laptop and log in to XP, the desktop shows up briefly and then quickly all disappears leaving me a blank wallpaper, at the same time popping up an error message:

userinit.exe application error:
The instruction at "0x77dd778e" reference memory at "0x77dd778e". The memory could not be "written".
Click on OK to terminate the program, or Cancel to debug.

here are the things I have done and tried so far:

I tried to boot up in the Safe Mode, but only a black background appears with Safe Mode on four corners and no desktop at all.

I then booted into the Safe Mode with DOS prompt, I ran AVG 7 virus scan, AVG spy-ware scan, Symantec anti-virus scan, Microsoft Malicious Software Removal tool, and still didn't catch anything major or fixed the problem.

Then I followed the steps in the Malware forum before I post the HijackThis log:
1. I ran the ATF temp file cleaner successfully.
2. when i tried to run mbam-setup.exe in the Dos window under Safe mode, it did not respond or proceed.
3. when I ran SUPERAntiSpyware.exe, I got the error:
windows installer: the system administrator has set the policies to prevent this installation
4. under the Dos safe mode, I don't get the network connectivity, so i couldn't get to run the Online - Panda Activescan as the guide suggests.
5. I wanted to generate a hijackthis log, and tried to run HJTInstall.exe to install in the Dos window under Safe mode, again it did not respond or proceed. so I can't even post a hijackthis log to start with.

what should I do now to find the malware and cure the problem?

thank you very much!
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Duplicate topic this one is closed.
Please do not make duplicate topics.
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