GP Fault or Fatal Exception Error on Intel MMX CPU

This article was previously published under Q156492
This article has been archived. It is offered "as is" and will no longer be updated.
When you are running a program or using a device driver that calls MMX-specific instructions in the retail release of Windows 95 on a systemwith an Intel processor supporting the MMX instruction set, the followingsymptoms may occur:

  • A general protection (GP) fault error message
  • A fatal exception error message on a blue screen
This problem does not occur with Windows 95 OEM Service Release 2 or later.
The retail release of Windows 95 does not properly support some MMXinstructions if they are called from a device driver or from program coderunning in protection level 0 (Ring 0, also known as privileged or Kernelmode). If these instructions are issued while the processor is operatingin Ring 0, a GP fault or other serious error may occur.
This problem no longer occurs in Windows 98. To resolve this problem, install the current version of Windows. For information about the current version of Windows, visit
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Article ID: 156492 - Last Review: 10/26/2013 04:29:00 - Revision: 2.0

  • Microsoft Windows 95
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