Consider the following scenario:

•	You have a computer that has a bridged Peripheral Component Interconnect (PCI) display adapter.
•	This display adapter is inserted into a PCI Express (PCIe) slot in the computer.
•	You upgrade the computer to Microsoft Windows XP Service Pack 2 (SP2).

In this scenario, you may receive the following error message when the computer restarts:

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This problem may occur if your computer uses an add-on PCI adapter that has an integrated PCI-to-PCI bridge and graphics adaptor. An example of this type of device is a remote access adapter that has multiple, integrated devices such as graphics and integrated device electronics (IDE) or Advanced Technology Attachment (ATA) controllers.

This problem occurs because the ISA Enable and VGA Enable bridge control registers may become incorrectly set. Therefore, the boot controller may not be assigned the correct PCI resources. If the boot controller is not assigned the correct PCI resources during the startup process, the hard disk from which Windows starts becomes inaccessible. Therefore, you experience the Stop error that is mentioned in the "Symptoms" section.

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To resolve this problem, follow these steps:

1.	Use the Recovery Console method as described in Microsoft Knowledge Base article 875350 to uninstall Windows XP SP2. For more information about how to uninstall Windows XP Service Pack 2 by using the Recovery Console, click the following article number to view the article in the Microsoft Knowledge Base: 875350 (http://support.microsoft.com/kb/875350/) How to remove Windows XP Service Pack 2 from your computer
2.	Install hotfix 890463.
3.	Reinstall Windows XP SP2.

Contact Microsoft Product Support Services (PSS) for help with this procedure. For information about how to contact Microsoft PSS, visit the following Microsoft Web site: For more information about how to help protect your computer when you remove Windows XP Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

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Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Windows XP, 32-bit editions

   Date         Time   Version            Size    File name
   --------------------------------------------------------------
   16-Dec-2004  02:44  5.1.2600.1615      62,976  Pci.sys
   16-Dec-2004  18:34  5.1.2600.2585      68,224  Pci.sys
 

Windows XP, 64-bit edition

   Date         Time   Version            Size    File name
   --------------------------------------------------------------
   16-Dec-2004  02:45  5.1.2600.1615     210,944  Pci.sys

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To work around this problem and to avoid having to remove Windows XP SP2, use one of the following methods.

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Method 1: Remove the bridged VGA adapter

To remove the bridged VGA adapter, follow these steps:

1.	Remove the bridged VGA adapter from the computer.
2.	Restart the computer, and then let the Windows Setup program finish the installation of Windows XP SP2.
3.	Shut down the computer, reinstall the bridged VGA adapter, and then restart the computer.

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Method 2: Put the bridged VGA adapter into a different slot

To put the bridged VGA adapter into a different slot, follow these steps:

1.	Move the bridged VGA adapter from the current slot in the computer to a different slot.
2.	Restart the computer, and then let the Windows Setup program finish the installation of Windows XP SP2.
3.	Shut down the computer, insert the bridged VGA adapter into the original slot, and then restart the computer.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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