"Error Loading Operating System" Error Message When You Restart Your Computer During Setup

Posted on 2006-04-02
Last Modified: 2008-01-09
Hi to all.

My computer was infected with some kind of virus.
When I try to reinstal WinXP everything is fine when I format disk,
and copying file is good too, but when I restart my computer first time during instalation
I get this message "Error Loading Operating System".

So I don't know is it my hard disk is demaged or is it somethig else?
Is it possible that virus can damage hard disk?

Please Help.
Greetings Predrag
Question by:KukiPei
    LVL 3

    Assisted Solution

    Run chkdsk before re-loading an OS. You can also do this now.
    LVL 32

    Accepted Solution

    I recommend resetting drive to completely remove all old partitions.  You can use manufacturer's utilities (zero fill or low level format) or Darik's Boot and Nuke available here:

    Test memory using Memtest86+  from Ultimate Boot CD available here:

    Try another XP install after completely wiping drive and testing memory, assuming there are no memory errors.
    LVL 47

    Assisted Solution

    I'm going to disagree slightly with willcomp.

    Yes, to completely remove all old partitions and then recreate.  There's options in Windows XP to do that.  Formatting should remove anything else on the disk.  

    There should be no need to zero fill or even low level format the disk.

    The MBR may be corrupt.  Unlikely but possible.  Obtain a floppy boot disk from and start from that.

    Run the following command at the prompt.

    fdisk  /mbr

    That should repair the MBR.

    LVL 11

    Assisted Solution

    by:Zuhir Elgmati
    there's Q like this befor here : the accepted answer is :
    >>>This issue may occur if your computer BIOS does not correctly manage or support the capacity of the hard disk on which you are installing Windows XP<<<
    Note the "manage" I think that's the problem, check if you can find a bios upgrade for your computer.

    and this Answer is derived from :

    Author Comment

    I have tryed allmost everything you suggest but it doesnt work.

    Anyway, thanks.
    LVL 32

    Expert Comment

    Did you reset/wipe hard disk?  I've seen similar occurrences where deleting existing partition(s) during Windows install was not sufficient.  HDD could be partitioned and formatted, but XP install failed with your symptoms.

    Author Comment

    Did you reset/wipe hard disk?

    I don't know what is it.
    How to do that?
    LVL 32

    Expert Comment

    See my earlier response.  Darik's Boot and Nuke will do the job.

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