My grateful thanks go to Eric Brodish of Microsoft Redmond for providing this very comprehensive list of Windows Update error codes!!
| Error Code | Dec Error Code | Error String | Description |
| 0x00000000 | -4294967296 | Success | |
| 0x00000001 | -4294967295 | ERROR_INVALID_FUNCTION | |
| 0x0000007B | -4294967173 | Error_Invalid_Name | The filename, directory name,or volume label syntax is incorrect |
| 0x00000275 | -4294966667 | Error_cant_enable_Deny_only | A group marked use for deny only can not be enabled |
| 0x0000041D | -4294966243 | ERROR_SERVICE_REQUEST_TIMEOUT | The service did not respond to the start or control request in a timely fashion. |
| 0x000004C3 | -4294966077 | Error_Session_Credential_Conflict | Multiple connections to a server or shared resource by the same user,using more than one user name, are not allowed. |
| 0x000004C5 | -4294966075 | Error_Dup_Domainename | The workgroup or domain name is already in use by another computer on the network. |
| 0x000005D5 | -4294965803 | NULL | |
| 0x00000619 | -4294965735 | error_Invalid_HW_Profile | The specified hardware profile configuration is invalid |
| 0x00000641 | -4294965695 | Error_Install_Service_failure | The Windows Installer Service could not be accessed. This can occur if you are running Windows in safe mode, or if the Windows Installer is not correctly installed. |
| 0x00000643 | -4294965693 | ERROR_INSTALL_FAILURE | Fatal error during installation |
| 0x00000652 | -4294965678 | ERROR_INSTALL_ALREADY_RUNNING | Another installation is already in progress. Complete that installation before proceeding with this install. |
| 0x000006D9 | -4294965543 | EPT_S_Not_Registered | There are no more endpoints available from the endpoint mapper. |
| 0x000006F6 | -4294965514 | RPC_X_BYTE_Count_TOO_Small | The byte count is too small |
| 0x00000963 | -4294964893 | NERR_BADPasswordCore | This share name or password is invalid |
| 0x00000BC2 | -4294964286 | Error_Success_Reboot_Required | |
| 0x00000C0B | -4294964213 | NULL | |
| 0x00000CC4 | -4294964028 | NULL | |
| 0x00000D47 | -4294963897 | NULL | |
| 0x00000E5C | -4294963620 | NULL | |
| 0x00000E74 | -4294963596 | NULL | |
| 0x0000109F | -4294963041 | NULL | |
| 0x00001112 | -4294962926 | Error_No_Media_In_Drive | No media in drive |
| 0x0000117A | -4294962822 | NULL | |
| 0x00001190 | -4294962800 | Error_Shutdown_IS_Scheduled | A system shutdown has already been scheduled |
| 0x00001234 | -4294962636 | Error_Port_Unreachable | No Service is operating at the destination network endpoint on the remote system |
| 0x00001396 | -4294962282 | Error_Wrong_Target_Name | Logon failure: The target account name is incorrect. |
| 0x000013D7 | -4294962217 | Error_Cluster_restype_Note_Supported | The specified node does not support a resource of this type. This amy be due to version inconsistancies or due to the absence of the resource DLL on this node. |
| 0x00001449 | -4294962103 | Error_Invalid_Showwin_Command | Cannot show or remove the window in the way specified |
| 0x00001633 | -4294961613 | NULL | |
| 0x000017C7 | -4294961209 | NULL | |
| 0x000017D2 | -4294961198 | NULL | |
| 0x000018BE | -4294960962 | NULL | |
| 0x00001AD4 | -4294960428 | NULL | |
| 0x00001ADA | -4294960422 | NULL | |
| 0x00001C70 | -4294960016 | NULL | |
| 0x00001CE8 | -4294959896 | NULL | |
| 0x00001D7A | -4294959750 | NULL | |
| 0x00001F1D | -4294959331 | NULL | |
| 0x00001F59 | -4294959271 | NULL | |
| 0x00002075 | -4294958987 | NULL | |
| 0x0000229A | -4294958438 | NULL | |
| 0x000022CA | -4294958390 | NULL | |
| 0x0000230B | -4294958325 | NULL | |
| 0x00002685 | -4294957435 | NULL | |
| 0x000028A5 | -4294956891 | NULL | |
| 0x00002ABF | -4294956353 | NULL | |
| 0x00002BBE | -4294956098 | NULL | |
| 0x00002D49 | -4294955703 | NULL | |
| 0x00002DA4 | -4294955612 | NULL | |
| 0x00002DDC | -4294955556 | NULL | |
| 0x00002EBD | -4294955331 | NULL | |
| 0x00002ED7 | -4294955305 | NULL | |
| 0x000032D8 | -4294954280 | NULL | |
| 0x000035DD | -4294953507 | NULL | |
| 0x000036F8 | -4294953224 | NULL | |
| 0x000037A1 | -4294953055 | NULL | |
| 0x000037FA | -4294952966 | NULL | |
| 0x0000384E | -4294952882 | NULL | |
| 0x000038F5 | -4294952715 | NULL | |
| 0x0000399D | -4294952547 | NULL | |
| 0x00003A5C | -4294952356 | NULL | |
| 0x00003D16 | -4294951658 | NULL | |
| 0x00003E44 | -4294951356 | NULL | |
| 0x00004016 | -4294950890 | NULL | |
| 0x000040CF | -4294950705 | NULL | |
| 0x00004146 | -4294950586 | NULL | |
| 0x000041F4 | -4294950412 | NULL | |
| 0x0000433D | -4294950083 | NULL | |
| 0x000043F9 | -4294949895 | NULL | |