Changed ACPI driver in device manager, rebooted, can't find ntfs.sys anymore!

Posted on 2008-11-05
Last Modified: 2012-08-13
Hi guys,

I have a Windows Server 2003 SP1 system.  It's using an intel ICH8R SATA RAID controller.  I originally had a piece of software (Ardence RTX) that required the ACPI driver to be set to uniprocessor.  A new version of RTX is now available, and it supports multi-core CPUs.  I performed the following steps:

1.  Removed RTX,
2.  Rebooted -- system booted fine
3.  Changed ACPI setting from Uniprocessor ACPI PC to Multiprocessor ACPI PC
4.  Rebooted -- system fails to boot, presents the following message:

 Windows could not start because the following file is missing or corrupt: System32\Drivers\Ntfs.sys

I'm not sure exactly what happened.  I tried the troubleshooting steps listed here (, but they didn't help.  The ntfs.sys file on disk and the one on my Windows 2003 disc are identical at a binary level according to a file comparison program that I have.

Does anyone know how I can revert to the old uniprocessor ACPI HAL driver in order to get the system to boot again?

Question by:TomPro
    LVL 51

    Expert Comment

    You can't change the HAL like that.  I'm not certain we can recover this properly.

    Have you tried Last Known Good Configuration from the F8 menu?

    LVL 1

    Accepted Solution

    I ended up wiping the disk and re-staging the system.  Lesson learned:  don't change the HAL unless you know it's absolutely necessary.

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