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Config.sys deleted by a virus


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#1 haken_zell

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Posted 20 May 2009 - 02:05 AM

Good day Bleeping Computer.,

i just want to ask, is there any way to fix it without reformatting computer?! The config.sys was deleted recently by a virus and i cant boot to windows, and ive tried to reformat the computer,.after just one day, my friend who owns the computer plug his mp3 player into it and turned it off after he finishes, but when he tries to open it later, config.sys was missing again.. :thumbsup: the computer doesnt have a internet so i cant update anti virus and other protection software..do i have to reformat it again?! or you guys have a better idea.. :flowers:

Thanks.. :trumpet:

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#2 haken_zell

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Posted 20 May 2009 - 11:10 AM

anyone?!pls :thumbsup:

#3 boopme

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Posted 20 May 2009 - 11:14 AM

try with your install Cd

Open the RUN box type sfc /scannow .. space between c and /
Let it run. Insert Cd when asked.
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#4 haken_zell

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Posted 20 May 2009 - 11:33 AM

thanks for replying boopme., :thumbsup:

do you mean the Windows XP CD?
i cant really boot on windows because the config.sys is missing..

thanks

#5 boopme

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Posted 20 May 2009 - 11:53 AM

My bad,misunderstood.. Meant the XP Cd tho. Will the PC boot off the XP CD.? Put it in the drive and reboot.. If so run a repair install.

Edited by boopme, 20 May 2009 - 11:54 AM.

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#6 haken_zell

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Posted 20 May 2009 - 12:33 PM

i see.. thank you., :thumbsup:

#7 boopme

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Posted 20 May 2009 - 01:15 PM

OK, let us know how you get on,
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#8 haken_zell

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Posted 21 May 2009 - 12:35 PM

ive decided to reformat it again, because there is a possibility that the virus is still there..
and ive install Returnil so it is more safer now.,

thanks :thumbsup:

#9 boopme

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Posted 21 May 2009 - 08:53 PM

Not an unwise decision to make. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. Wiping your
drive, reformatting, and performing a clean install of the OS or doing a factory restore removes everything and is the safest action but I cannot make that decision for you.

Reformatting a hard disk deletes all data. If you decide to reformat, you can back up all your important documents, data files and photos. The safest practice is not to
backup any autorun.ini or .exe files because they may be infected. Some types of malware may disguise itself by adding and hiding its extension to the existing extension of
files so be sure you take a close look at the full name. After reformatting, as a precaution, make sure you scan these files with your anti-virus prior to copying them back to your hard drive.

The best proceedure is a low level format. This completely wipes the drive. Then reinstall the OS.
Use the free version of Active@ KillDisk.
Or Darik's Boot And Nuke

The best sources of Information on this are
Reformatting Windows XP
Michael Stevens Tech

Of course also feel free to ask anything on this in the XP forum. They'd be glad to help.
==============================
2 guidelines/rules when backing up

1) Backup all your important data files, pictures, music, work etc... and save it onto an external hard-drive. These files usually include .doc, .txt, .mp3, .jpg etc...
2) Do not backup any executables files or any window files. These include .exe's, .scr, .com, .pif etc... as they may contain traces of malware. Also, .html or .htm files
that are webpages should also be avoided.
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#10 haken_zell

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Posted 22 May 2009 - 08:06 AM

thank you so much, this is very useful..

uhm, i didnt back up actually, because they told me that it is ok, and im planning to use Recovery Program in case they have important file needed.,do you think its a good idea using Recovery programs or no?!

and can i ask, what do you mean by low level format?!
and what does Active Kill Disk and Dariks Boot and Nuke actually does?!


thanks again :thumbsup:

#11 boopme

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Posted 22 May 2009 - 02:36 PM

simply put a low level format erases the drive platter . nothing is left.. No malware can survive it. That is whet those tools do..
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