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Posted on Jul 16, 2008
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ACPI Multiprocessor PC is trying to install on my friend's computer. It started ocurring after she did system recover. It looks like she now has two hard drives -- one fat32 (?) and the regular drive c. At boot up, the system tries to install ACPI Multiprocessor PC. How can I get it to stop trying to install it -- or should I install it?

  • Anonymous Apr 04, 2009

    My problem is identical as what is mentioned above. MIne says that "ACPI multiprocessor pc hardware is not recognized by Windows logo. Install anyway?" Should I install it?

  • clark styx valencia
    clark styx valencia May 11, 2010

    Windows XP Home Edition supports one (1) CPU.

    Windows XP Professional supports one (1) or two (2) CPUs.

    Which version of Windows XP did you install?

×

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  • Expert 150 Answers
  • Posted on Jul 18, 2008
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YES, do let it install !
=====================

ACPI stands for Advanced Configuration and Power Interface

This is a firmware interface in BIOS, that allows operating systems to call BIOS routines for managing power related
system hardware parameters:

1) CPU mode (Sn states): Run, Suspend, Sleep, hibernate ...

2) CPU Voltage and frequency

3) Fan speed... etc....

==============

Multi-processor PC, means that the firmware has detected a
multi processor system or is confused by the hardware. There
are several conditions that cause this interpretation:

a) A genuine multi-CPU Board with 2 or 4 CPU sockets.

b) A multi-core, single CPU, such as the new Intel
CORE-2 DUO series...

c) Interleaved RAM on a single CPU, with dual buses.

This is OK, and nothing to worry about.

===================

The ACPI interface is very advanced and complex, about 3500
pages of engineering specifications, and most P'sC only use
a very tiny sub-set of its capability.

The ground level ACPI settings and options are contained within
the system BIOS. The best solution is to set them to their
default settings, unless you know what all the settings mean.

To access the BIOS settings, on most PC's:
Press DEL or F1 right after the POST/memory test.

Depending on the BIOS settings, the operating system's HAL
(Hardware Abstraction Layer) may need to install additional
interface and control drivers.

On a desktop, these so called "GREEN" power saving features
are a horrible pain in the neck. and I would disable them all
together, unless you pay $20,000 per months for your
electricity.

On a laptop, however, these drivers are fairly important to
significantly extend your battery life, so you should enable
them.

If the computer was restored to factory condition, by pressing
a magic "blue" button, these drivers are part of the original factory installation and should be installed, just let the PC recursively do its thing, until it calms down.

=============

Most name brand manufactures provide a hidden partition on
the hard driver, typically a FAT-32, which contains a complete
set of recovery files, unique to the PC model and all the features
it supports.

This restore partition is most often formatted as FAT-32,
because FAT can be accessed using primitive BIOS calls
while NTFS cannot:

1) FAT16 = Original DOS, support drives < 2GB only.

2) FAT32 = Extended FAT-16, for larger drives.

3) NTFS = Windows NT, 2000, XP, and Vista only.
Cannot be accessed before Windows is running.


The manufacturer then provides a boot/ BIOS hook,
activated by their MAGIC or BLUE button, which in turn
un-hides this restore partition, loads Windows PE
(a special pre-install/ repair version of windows),
and then loads the recovery program.

==========

In any event, you need to let the installation/ restore process
finish, including the ACPI install.

After several annoying re-boot cycles, this process will (should)
restore the PC to original factory conditions.

Factory restoration is, however, a very drastic and destructive process. All your settings are lost and (depending on the particular system) sometimes your data as well. I should
be avoided like a biker on a bad day.

It is a good idea to back-up everything possible, before taking such a drastic step, and I prefer to use an external USB drive for doing this. Also this step should only be used as a last resort.

===

However, in your case, all the DRASTIC and LOSSY part has
happened already, so you have no choice but to proceed and
let it finish. Once the restoration is complete, the FAT-32
partition should disappear, that is it will be hidden again.

Do not damage this partitions, unless you own a set of factory
repair CD's !!!

It is also a good idea to request the FACTORY repair CD's for
your machine from the manufacturer and keep them in a safe
place.

Once you have the recovery CD's, you can delete the hidden
recovery partition, and use the recovered space for more
useful things, such as data or applications.

To do this, you need a partition manager tool, such a Norton's
Partition Magic or Acronis tools. Norton's bought the original
tool from Power Quest, and royally phluquified it, so I much
prefer Acronis these days.

====

Also after you PC is fully restored, go into the power settings
in the control panel (or via the screen saver settings) and
configure the ACPI as you wish. But you must install it first.


Hope this answers all your questions,
please rate my answers.

Martin.


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My problem is identical as what is mentioned above. MIne says that "ACPI multiprocessor pc hardware is not recognized by Windows logo. Install anyway?" Should I install it

ACPI is a setting on the BIOS.
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Don't forget to rate this answer if it helps.
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I need to disable tha acpi on an acer travelmate 529tx but i don't know how to do it. i am trying to install xp after a failure. i get bsod and says to press f7 when i install storage drivers but i need a...

I have seen on many forums that ACPI makes a lot of troubles to a lot of users under Windows. I will try to explain several things about ACPI and I hope that you will be able to solve your problems after you read this article. I cover only most encountered issues, but always there is a choice even if it's called ACPI disable.:)
The computer ACPI support is detected in the setup stage, but there are less frequent cases when ACPI is not detected and the Standard PC HAL is installed. If you want to force the installation of the ACPI HAL:
1. At the blue screen of the Windows XP setup when it prompts you to press F6 for additional mass storage devices press F5 and you will have a list of options.
2. Choose the proper HAL for your machine remembering that there are also different HALs for multiprocessor machines.
3. Complete the setup, go to Setup / Control Panel / System / Hardware / Device Manager / Computer. If you have listed the Advanced configuration and Power Management (ACPI) the process was completed successfully.
Warning: You can do the same thing if you don't want to install ACPI and your BIOS doesn't support ACPI disable setting. Just choose the Standard Computer HAL from the list of options.
Another method to disable ACPI is:
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  • before XP Setup Wizard to load, boot into DOS and change ACPIEnable = 0 from ACPIEnable = 1 in file c:\txtsetup.sif
The reason why ACPI is not installed on a computer with known ACPI compatibility may be a Microsoft known subtle incompatibility which can lead to hardware instability. In the installation step Windows XP checks the BIOS compatibility with ACPI and the BIOS presence on a known bad list. If the BIOS is there ACPI is not installed. Of course than errors can occur so you can force the ACPI installation (not recommended).

Try disabling it in the BIOS first, this can not be done on a computer with the operating system already installed as it will cause the machine to stop. MUST be done when you initially install the OPERATING SYSTEM.
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