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Error Message:

UNEXPECTED_KERNEL_MODE_TRAP

Explanation:

This Stop message means that one of two types of problems occurred in kernel-mode, either the kind of condition that the kernel is not allowed to have or catch (a bound trap), or an unrecoverable error. Occasionally, this message can be caused by software problems, but the most common cause is hardware failure. It usually occurs after the installation of faulty or mismatched hardware (especially memory) or in the event that installed hardware fails. Setting the CPU to run at speeds above the rated specification (known as overclocking the CPU) can also cause this error.

User Action:

If hardware was recently added to the system, remove it to see if the error recurs. If existing hardware has failed, remove or replace the faulty component. Run hardware diagnostics supplied by the system manufacturer, especially the memory scanner, to determine which hardware component has failed. For details on these procedures, see the owners manual for your computer. Check that all network adapters in the computer are properly seated. Use an ink eraser or an electrical contact treatment, available at electronics supply stores, to ensure network adapter contacts are clean. If the error appears on a newly installed system, check the availability of updates for the following: firmware on RISC systems, as well as BIOS revisions on the motherboard, the SCSI controller, or network adapters. Updates of this kind are typically available on the web site or BBS of the hardware manufacturer. Confirm that all hard disks, hard disk controllers, and SCSI adapters are listed on the Microsoft Windows 2000 Hardware Compatibility List (HCL) on http://www.microsoft.com/. If the error occurred after the installation of a new or updated device driver, remove or replace the driver. If, under this circumstance, the error occurs during the startup sequence and the system partition is formatted with NTFS, you might be able to use Safe Mode to rename or delete the faulty driver. If the driver is used as part of the system startup process in Safe Mode, start the computer using the Recovery Console in order to access the file. Restart your computer, and then press F8 at the character-mode menu that displays the operating system choices. At the resulting Windows 2000 Advanced Options menu, choose the Last Known Good Configuration option. This option is most effective when only one driver or service is added at a time. If the CPU was overclocked, return the CPU to the default clock speed setting. Check the System Log in Event Viewer for additional error messages that might help pinpoint the device or driver causing the error. Disabling memory caching of the BIOS might also resolve it. If you encountered this error while upgrading to Windows 2000, it might be caused by a device driver, a system service, a virus scanner, or a backup tool that is incompatible with the new version. If possible, remove all third-party device drivers and system services and disable any virus scanners prior to upgrading. Contact the software manufacturer to obtain updates of these tools. Finally, if all the above steps fail to resolve the error, take the system motherboard to a repair facility for diagnostic testing. A crack, a scratched trace, or a defective component on the motherboard can also cause this error. For more troubleshooting information about this Stop message, refer to the Microsoft Knowledge Base at http://support.microsoft.com/support.

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