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

3 codes

0xC0000005Critical

STATUS_ACCESS_VIOLATION

Memory access violation. A process attempted to access memory it has no rights to. Often causes application crashes.

NT Status-1073741819

0xC0000185Critical

STATUS_IO_DEVICE_ERROR

The request could not be performed because of an I/O device error. Often a failing disk.

NT Status-1073741435

0xC0000257Critical

STATUS_DOWNGRADE_DETECTED

A downgrade attack has been detected. Kerberos security failure.

NT Status-1073741225