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.).
134 codes
0x80004001ErrorE_NOTIMPL
Not implemented. The requested COM interface or method is not available.
0x80004002ErrorE_NOINTERFACE
No such interface supported by the COM object.
0x80004005ErrorE_FAIL
Unspecified COM failure. Check DCOM settings and event logs for details.
0x80010001ErrorRPC_E_CALL_REJECTED
Call was rejected by callee. COM server is busy or not responding.
0x80010108ErrorRPC_E_DISCONNECTED
The object invoked has disconnected from its clients. COM server crash.
0x80040154ErrorREGDB_E_CLASSNOTREG
Class not registered. The COM class is not registered on this machine.
0x800401F3ErrorCO_E_CLASSSTRING
Invalid class string. The CLSID or ProgID is not registered.
0x80041001ErrorWBEM_E_FAILED
General WMI failure. Check WMI service and run winmgmt /verifyrepository.
0x80041002ErrorWBEM_E_NOT_FOUND
WMI object or property not found.
0x80041003ErrorWBEM_E_ACCESS_DENIED
WMI access denied. Check DCOM and WMI namespace permissions.
0x80041006ErrorWBEM_E_OUT_OF_MEMORY
WMI ran out of memory to complete the operation.
0x8004100EErrorWBEM_E_INVALID_NAMESPACE
Specified WMI namespace does not exist.
0x80041010ErrorWBEM_E_INVALID_CLASS
Specified WMI class does not exist in the namespace.
0x80041064ErrorWBEM_E_DATABASE_VER_MISMATCH
WMI repository version mismatch. Rebuild with winmgmt /resetrepository.
0x8004106CErrorWBEM_E_QUOTA_VIOLATION
WMI quota was violated. Too many concurrent WMI operations.
0x8004107AErrorWBEM_E_TIMED_OUT
WMI operation timed out. The query or operation took too long to execute.
0x8004FE21ErrorOFFICE_SUBSCRIPTION_ERROR
Microsoft 365 subscription issue. Sign out and back in to Office, or check license assignment.
0x8004FE33ErrorOFFICE_SUBSCRIPTION_NOT_FOUND
No valid Microsoft 365 subscription found for this account. Check license in M365 admin center.
0x80070002ErrorERROR_FILE_NOT_FOUND (WU)
Windows Update cannot find required files. Try running the Windows Update troubleshooter or DISM.
0x80070005ErrorERROR_ACCESS_DENIED (WU)
Windows Update access denied. Often caused by corrupted system files or antivirus interference.
0x80070005ErrorE_ACCESSDENIED (DCOM)
COM access denied. Check DCOM Launch and Activation permissions in Component Services.
0x8007000EErrorERROR_OUTOFMEMORY (WU)
Windows Update ran out of memory. Free up RAM and disk space.
0x8007001FErrorERROR_GEN_FAILURE (WU)
General failure during Windows Update. Run SFC /scannow and DISM /RestoreHealth.
0x80070020ErrorERROR_SHARING_VIOLATION (WU)
A file needed by Windows Update is locked by another process.
0x80070035ErrorERROR_BAD_NETPATH
The network path was not found. Check firewall, SMB settings, and network connectivity.
0x80070043ErrorERROR_BAD_NET_NAME
The network name cannot be found. Check the UNC path or DNS resolution.
0x80070070ErrorERROR_DISK_FULL (WU)
Not enough disk space to install updates. Free up space on the system drive.
0x80070422ErrorERROR_SERVICE_DISABLED
Windows Update service is disabled. Enable and start the wuauserv service.
0x80070490ErrorERROR_NOT_FOUND (WU)
Element not found. Often a corrupt CBS store — run DISM /RestoreHealth.
0x800705B4ErrorERROR_TIMEOUT (WU)
Windows Update operation timed out. Check network connectivity and WSUS configuration.
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