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My Compaq Presario SR5601UK running Windows Vista Home Premium locked up today. When trying to reboot it it now freezes on the moving bar that shows on the screen prior to the windows logo and log in screen appering. Ran diagnostics which says: Error Code BI0HD-4 Error: Unititialized/Corrupt Boot Structure Detected Tried Booting in Logged Safe Mode and the computer stops loading files at: \windows\system32\drivers\ahcix86s.sys Help please

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  • jskelton Feb 07, 2010

    OK in theory - Problem is I don't have the original Windows Vista discs - The machine was shipped with Vista pre loaded - I do have the Compaq Recovery Discs which I made after setting up the computer.

    If I format the hard disc I loose everything - How do I then set it up again?



  • jskelton Feb 07, 2010

    I don't have back up hard drives & I don't have OEM Windows Vista Discs.
    One of the boot sequence files seems to be corrupted - can I get round this somehow??

  • jskelton Feb 07, 2010

    Yep - Tried booting from last know good config (x2) - Stops at \windows\system32\drivers\ahcix86s.sys

    OK - How do I reload system from recovery discs?



  • jskelton Feb 07, 2010

    OK - Put recovery disc 1 in CD/DVD Drive & Boot computer

    No on screen instructions appear - It just goes straight to

    'Windows is loading files' with a white progression bar moving across the bottom of the screen from L to R

    Then windows moving bar appears in the centre of the screen (just as for normal boot up)

    and stops just lie it has done before??

    The 'System Recovery' screens do not appear?

    Me thinks this problem is a bit worse that I first thought!

    Any ideas?





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Have y tried booting up to last known good configuration in the hot key boot menu, if that doesn't work you will need to reload the operating system from the recovery disks.

Posted on Feb 07, 2010

  • yadayada
    yadayada Feb 07, 2010

    to reload you just put the discs in the drive and follow the on screen instructions.


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The error code BI0HD-4 is a hard disk error. You need to delete all partitions on your hard disk and create new ones and format them
This will solve the problem.

Good luck and have a great day!

Posted on Feb 07, 2010

  • Melvin Ramos
    Melvin Ramos Feb 07, 2010


    Backing up the files into another HD is the safest thing to do before reformatting your computer. Yes, reformatting it would lose everything, but you could restore the files once you have a back up.

    That is the best thing that I could advise you.

    Thank you for your response.



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