Windows Registry Key for System HAL Information

This article explains how to find Hardware Abstraction Layer (HAL) information within the Windows Registry using the Registry Editor (Regedit). It details the primary registry paths that store the active HAL type, device configuration, and associated driver properties responsible for bridging Windows software with the underlying hardware architecture.

Primary HAL Registry Keys

The specific HAL information in Windows is distributed across a few dedicated registry locations under the HKEY_LOCAL_MACHINE (HKLM) hive.

1. Computer Class and HAL Device Description

The primary location detailing the configured HAL type and driver description is:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E966-E325-11CE-BFC1-08002BE10318}

• Subkey 0000: Contains configuration details for the computer’s system HAL.
• DriverDesc: Displays the active HAL profile name (e.g., ACPI x64-based PC or Advanced Configuration and Power Interface (ACPI) PC).
• InfPath: Shows the setup information file (typically hal.inf).
• MatchingDeviceId: Indicates the hardware identifier associated with the active HAL implementation.

2. HAL Service Key

To inspect the loaded HAL service settings and driver startup parameters:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\hal

This key contains the binary parameters and start type configurations for hal.dll.

3. Hardware Description Tree

Dynamic hardware configuration detected during system boot can be viewed under:

HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System

This volatile registry tree reflects hardware abstraction data detected by the Windows boot loader and the kernel, including multi-processor and motherboard interface characteristics.

How to Access HAL Information in Regedit

1. Press Win + R, type regedit, and press Enter.

2. Navigate to:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E966-E325-11CE-BFC1-08002BE10318}\0000

3. Look at the data value for DriverDesc in the right-hand pane to determine the exact HAL installed on the system.