Repair Windows Error 0x00000079    |    STOP 0x00000079    |    Fix Error Code 0x00000079


STOP Errors are usually the result of a hardware malfunction or device driver issue. It is also possible to receive a Blue Screen Error due to bad system memory, malfunctioning power supply, components overheating, or hardware overclocked beyond its specification. In older versions of the Windows OS you may also receive Blue Screen Errors due to incompatible DLL files.

Since the only option when receiving a Blue Screen Error is to reboot, any unsaved data is lost. With that in mind, it is very important to eliminate these errors to protect your data.

Basic Troubleshooting

Troubleshooting STOP Errors can be a difficult and time consuming process. Try these basic steps to fix your own Blue Scree Error. We hope it will help you avoid an expensive service call and provide a rewarding experience of solving the problem on your own.

Advanced Troubleshooting

The following details are for advanced users. These are provided for your convenience and may help those with advanced knowledge discover the root cause of their STOP Error.


The MISMATCHED_HAL stop error code has a value of 0x00000079. This stop error code indicates that the Hardware Abstraction Layer (HAL) revision level or configuration does not match that of the kernel or the computer.


The following parameters appear on the blue screen. Parameter 1 indicates the type of mismatch.

Parameter 1Parameter 2Parameter 3Parameter 4Cause.
0x1The major processor control block (PRCB) level of Ntoskrnl.exe.The major PRCB level of Hal.dll.ReservedThe PRCB release levels are mismatched. (Something is out of date.)
0x2The build type of Ntoskrnl.exe.The build type of Hal.dll.ReservedThe build types are mismatched.
0x3The size of the loader parameter extension.The major version of the loader parameter extension.The minor version of the loader parameter extension.The loader (ntldr) and HAL versions are mismatched.

When Parameter 1 equals 0x2, the following build type codes are used:

  • 0: Multiprocessor-enabled free build
  • 1: Multiprocessor-enabled checked build
  • 2: Single-processor free build
  • 3: Single-processor checked build


The MISMATCHED_HAL stop error code often occurs when a user manually updates Ntoskrnl.exe or Hal.dll.

The error can also indicate that one of those two files is out of date. For example, the HAL might be designed for Microsoft Windows 2000 and the kernel is designed for Windows XP. Or the computer might erroneously have a multiprocessor HAL and a single-processor kernel installed, or vice versa.

The Ntoskrnl.exe kernel file is for single-processor systems and Ntkrnlmp.exe is for multiprocessor systems. However, these file names correspond to the files on the installation media.After you have installed the Windows operating system, the file is renamed to Ntoskrnl.exe, regardless of the source file that is used. The HAL file also uses the name Hal.dll after installation, but there are several possible HAL files on the installation media. See Installing Just the Checked Operating System and HAL for details.

Resolving the Problem

Restart the computer by using the product CD or the Windows Setup disks. At the Welcome screen, press F10 to start the Recovery Console. Use the Copy command to copy the correct HAL or kernel file from the original CD into the appropriate folder on the hard disk. The Copy command detects whether the file that you are copying is in the Microsoft compressed file format. If so, it automatically expands the file that is copied on the target drive.

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STOP 0x00000079    |    Fix Error Code 0x00000079    |    MISMATCHED_HAL