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.).
23 codes
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.
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.
0x80070070ErrorERROR_DISK_FULL (WU)
Not enough disk space to install updates. Free up space on the system drive.
0x800700B7WarningERROR_ALREADY_EXISTS (WU)
Update file already exists. May indicate a partial previous download.
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.
0x8007054FErrorERROR_INTERNAL_ERROR (WU)
An internal error occurred in Windows Update.
0x80073701ErrorERROR_SXS_ASSEMBLY_MISSING
A required assembly is missing from the WinSxS store. Run DISM /RestoreHealth.
0x80244007ErrorWU_E_PT_SOAPCLIENT_SOAPFAULT
SOAP client failed due to a SOAP fault. Check WSUS or Windows Update connectivity.
0x8024000BWarningWU_E_CALL_CANCELLED
Operation was cancelled by Windows Update.
0x8024000EErrorWU_E_XML_INVALID
Windows Update found invalid information in the update XML.
0x80240016WarningWU_E_INSTALL_NOT_ALLOWED
Operation tried to install while another installation was in progress.
0x80240020WarningWU_E_NO_INTERACTIVE_USER
No interactive user is logged on — update requires a user session.
0x80244022ErrorWU_E_PT_HTTP_STATUS_SERVICE_UNAVAIL
HTTP 503 from WSUS or Windows Update — server temporarily unavailable.
0x80242006ErrorWU_E_UH_INVALIDMETADATA
Update handler could not complete because the update contains invalid metadata.
0xC1900101CriticalMOSETUP_E_DRIVER_FAILURE
Feature update failed due to a driver issue. Common during Windows 10/11 upgrades. Update or remove problematic drivers.
0xC1900107WarningMOSETUP_E_CLEANUP_PENDING
A cleanup operation is still pending from a previous upgrade. Reboot and retry.
0xC1900200CriticalMOSETUP_E_COMPAT_SYSREQ_BLOCK
System does not meet minimum requirements for the Windows upgrade.
0xC1900208CriticalMOSETUP_E_COMPAT_INSTALLREQ_BLOCK
An incompatible app is blocking the Windows upgrade. Uninstall flagged apps and retry.