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Windows Error Codes

Searchable reference for Windows error codes — system errors, BSOD stop codes, NTSTATUS, WMI, RPC, MSI installer, AD/Kerberos, BitLocker, DNS, VPN, Hyper-V, COM/DCOM and more. Each entry includes the hex/decimal value, severity, root causes, and a step-by-step troubleshooting workflow.

How to read a Windows error code

Windows surfaces error codes through Win32, NTSTATUS, HRESULT, and many subsystem-specific spaces. Each code has a hex form (e.g. 0x80070005), a signed decimal form (-2147024891), and a symbolic name (ERROR_ACCESS_DENIED). This page lets you look up any of those forms, see what triggers the code, and follow a vetted troubleshooting workflow tuned for the originating subsystem (Windows Update, BSOD, AD/Kerberos, BitLocker, etc.).

All categories System errors Windows Update BSOD stop NT Status AD / Kerberos RPC / Network WMI MSI Installer Office activation BitLocker DNS VPN / Remote Hyper-V COM / DCOM

Severity:All severities Critical Error Warning Info

134 codes

0x0000007EError

ERROR_MOD_NOT_FOUND

The specified module could not be found. Missing DLL or dependency.

System errors126

0x0000007FError

ERROR_PROC_NOT_FOUND

The specified procedure could not be found.

System errors127

0x000000D8Error

ERROR_NOACCESS

Invalid access to memory location.

System errors216

0x00000641Error

ERROR_INSTALL_SERVICE_FAILURE

Windows Installer service could not be accessed. Start the msiserver service.

MSI Installer1601

0x00000643Error

ERROR_INSTALL_FAILURE

Fatal error during installation. Check MSI log for root cause. Often a permissions or dependency issue.

MSI Installer1603

0x00000645Error

ERROR_UNKNOWN_PRODUCT

This action is only valid for products that are currently installed.

MSI Installer1605

0x00000653Error

ERROR_INSTALL_PACKAGE_OPEN_FAILED

This installation package could not be opened. Check path and permissions.

MSI Installer1619

0x00000654Error

ERROR_INSTALL_PACKAGE_INVALID

This installation package could not be opened. It may be corrupt.

MSI Installer1620

0x00000659Error

ERROR_INSTALL_PACKAGE_REJECTED

Installation rejected by system policy. Check Software Restriction Policies or AppLocker.

MSI Installer1625

0x00000667Error

ERROR_INVALID_COMMAND_LINE

Invalid command line argument for msiexec.

MSI Installer1639

0x0000251DError

DNS_ERROR_RCODE_FORMAT_ERROR

DNS server unable to interpret format.

0x0000251EError

DNS_ERROR_RCODE_SERVER_FAILURE

DNS server failure.

0x00002521Error

DNS_ERROR_RCODE_REFUSED

DNS operation refused.

0x000025B3Error

DNS_ERROR_ZONE_DOES_NOT_EXIST

DNS zone does not exist.

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