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Pc Will Not Boot (after Malware Removal)


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#1 bostella

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Posted 16 July 2007 - 02:50 PM

Hi, I'm just arriving from the Spyware/Malware topic, where SifuMike helped me a lot. I got rid of several Trojan viruses and various Adwares, but my PC will not boot. I fear the boot sector to be sick...

Whichever boot mode I select (Safe, Safe with Network, Normal, Debug, Command prompt), my PC gets rebooted just before the boot sequence end...I thus chose to force it not to reboot, and always reach a blue screen with UNBOOTABLE DEVICE at the top. It's worth mentioning that all along the infection, I couldn't use Normal mode, only Safe mode. But now, Safe mode doesnt work either.

I'm using XP Sp2, and have the Windows XP installation CD. Can I boot from an alternate device (floppy ? How do I build it ?), or is there a disaster recovery procedure I can try ?

Thanks so much.

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#2 garmanma

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Posted 16 July 2007 - 03:14 PM

I'm using XP Sp2, and have the Windows XP installation CD. Can I boot from an alternate device (floppy ? How do I build it ?), or is there a disaster recovery procedure I can try ?

First you must change the boot order in the BIOS. You make the CD drive the first boot device, insert the XP disk in the drive, save changes in the BIOS and reboot the machine. Follow the instructions here.
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Edited by garmanma, 16 July 2007 - 03:16 PM.

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#3 bostella

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Posted 16 July 2007 - 03:34 PM

Mark, thanks, this won't erase any personal data on the drive right ?

Btw, I'm getting a weird error,

CDBOOT : Memory overflow error

when trying to boot on the CD....

#4 Budapest

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Posted 17 July 2007 - 02:09 AM

Hello bostella,

I hunted around on the net a little researching your CDBOOT: Memory overflow error. It seems that this problem can be caused if your CD drive is not getting sufficent power. If you have more than one drive on your system try the other drive. Also, you should check all your connections inside the case to ensure that none of them are loose.

Another thing you can try is to burn a UBCD and use that to try and boot your computer. If it works with the UBCD then I would begin to suspect that your Windows XP installation CD is faulty/scratched.

A third option would be to get one of those drive cleaning kits to clean the laser in the drive.
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#5 bostella

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Posted 17 July 2007 - 03:22 PM

Hi Budapest - The CD works fine, just tried it on another PC......

The full error message is :

Boot from AtAPI CD ROM
Hard Drive
CDBOOT : Memory overflow error
CDBOOT : Memory overflow error
...
CDBOOT : Memory overflow error
(endless loop)

I have built a UBCD which I can boot from too, are there any diagnostics you could suggest ?

Thanks.

#6 Budapest

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Posted 18 July 2007 - 01:11 AM

I must admit I'm stumped. You could try running the memtest utility on the UBCD. You can also use the UBCD to copy important files from the hard drive. Hopefully another member here will have some more suggestions.
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#7 bostella

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Posted 24 July 2007 - 06:05 AM

Hi Budapest - does UBCD allow me to backup important user files ? I have an external USB HD I can use for that, just not sure it can be mounted on a DOS session (as I don't think UBCD can start a windows instance).

Thanks.

#8 usasma

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Posted 24 July 2007 - 06:14 AM

The UBCD has file copying tools built into it - but you'll need to ensure that you have a device plugged in that's recognized by the UBCD. My copy of the PE environment recognizes USB devices if they're plugged in prior to booting up.
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#9 bostella

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Posted 26 July 2007 - 04:16 AM

Usasma, thanks. Which tool exactly should I use, UBCD has so many.......

#10 Budapest

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Posted 26 July 2007 - 04:31 AM

Try using Necromancer's DOS Navigator.
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