Windows Update Agent updated itself
Operation completed successfully but there were errors applying the updates
A callback was marked to be disconnected later because the request to disconnect the operation came while a callback was executing
The system must be restarted to complete installation of the update
The update to be installed is already installed on the system
The update to be removed is not installed on the system
The update to be downloaded has already been downloaded
Windows Update Agent was unable to provide the service.
The maximum capacity of the service was exceeded.
An ID cannot be found.
The object could not be initialized.
The update handler requested a byte range overlapping a previously requested range.
The requested number of byte ranges exceeds the maximum number (2^31 - 1).
The index to a collection was invalid.
The key for the item queried could not be found.
Another conflicting operation was in progress. Some operations such as installation cannot be performed twice simultaneously.
Cancellation of the operation was not allowed.
Operation was cancelled.
No operation was required.
Windows Update Agent could not find required information in the update's XML data.
Windows Update Agent found invalid information in the update's XML data.
Circular update relationships were detected in the metadata.
Update relationships too deep to evaluate were evaluated.
An invalid update relationship was detected.
An invalid registry value was read.
Operation tried to add a duplicate item to a list.
Operation tried to install while another installation was in progress or the system was pending a mandatory restart.
Operation was not performed because there are no applicable updates.
Operation failed because a required user token is missing.
An exclusive update cannot be installed with other updates at the same time.
A policy value was not set.
The operation could not be performed because the Windows Update Agent is self-updating.
An update contains invalid metadata.
Operation did not complete because the service or system was being shut down.
Operation did not complete because the network connection was unavailable.
Operation did not complete because there is no logged-on interactive user.
Operation did not complete because it timed out.
Operation failed for all the updates.
The license terms for all updates were declined.
There are no updates.
Group Policy settings prevented access to Windows Update.
The type of update is invalid.
The URL exceeded the maximum length.
The update could not be uninstalled because the request did not originate from a WSUS server.
Search may have missed some updates before there is an unlicensed application on the system.
A component required to detect applicable updates was missing.
An operation did not complete because it requires a newer version of server.
A delta-compressed update could not be installed because it required the source.
A full-file update could not be installed because it required the source.
Access to an unmanaged server is not allowed.
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