How to Upgrade Windows 2000 to Use an ACPI HAL

• Microsoft Windows 2000 Professional
• Microsoft Windows 2000 Server
• Microsoft Windows 2000 Advanced Server
• Microsoft Windows 2000 Datacenter Server

SUMMARY

This article describes how to configure your computer running Windows 2000 to use either a standard APM hardware abstraction layer (HAL) or an ACPI enabled HAL.

MORE INFORMATION

To change the Windows 2000 Standard HAL to ACPI HAL, use Winnt32.exe to install Windows 2000 over the current installation. If you try to change the type of HAL without running Setup, you may not be able to start Windows 2000 successfully again or you may experience hardware and other stability problems.

You cannot change between Standard and ACPI HALs because of the different way an ACPI and a non-ACPI BIOS enumerate hardware. The copy of the hardware tree, which is kept in the Windows 2000 registry, is stored differently for each type of HAL. If you change the HAL without running Setup again, Windows 2000 may not be able to find hardware components needed to start the computer.

NOTE: You can use Device Manager to change from a single-processor HAL to a multiple-processor HAL.

For additional information, please see the following article(s) in the Microsoft Knowledge Base:

Q237556 Troubleshooting Windows 2000 Hardware Abstraction Layer Issues

Q216573 How Windows 2000 Determines ACPI Compatibility

Q197055 Disabling ACPI Support in BIOS Results in Error Message

Additional query words: win2000hotsetup

Keywords : kbenv kbhw kbsetup
Version : WINDOWS:2000
Platform : WINDOWS
Issue type : kbhowto