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.).
8 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.
0x80070005ErrorE_ACCESSDENIED (DCOM)
COM access denied. Check DCOM Launch and Activation permissions in Component Services.