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COMADMIN_E_ALREADYINSTALLED
COM+ installation identity and duplicate state: exact meaning of COMADMIN_E_ALREADYINSTALLED
The COM object being registered is already present in the target catalog context. An installation or registration path attempts to add an object that COM+ already recognizes.
Windows describes this condition as “The object is already registered”.
Where the result occurs
COM+ installation updates the catalog, class registration, type-library metadata, and files as one supported deployment workflow; a duplicate result must be resolved at that workflow boundary. In the specific case of this result, resolve the existing CLSID, application, and component file before deciding whether the operation is an idempotent deployment or a version conflict.
Evidence to collect before repair
- Evidence should include application ID, CLSID, component DLL path, version, and hash, captured before a repair changes state.
- Collect existing Components and Applications collection entries when diagnosing this result; without it the symbolic HRESULT is underdetermined.
- Record installer/package identity and previous deployment result.
- Preserve registry and catalog ownership for the conflicting identifier; it anchors the failure to the real administration object.
Diagnostic sequence
- enumerate the existing application and component before changing anything.
- The next diagnostic action is to decide whether the operation is install, update, repair, or migration.
- To isolate this result, use the owning installer or COMAdmin method for the chosen path.
- Avoid manual deletion of only catalog or registry fragments.
- repopulate and compare the resulting identities and file versions.
Difference from nearby COMADMIN results
COMADMIN_E_APPLICATIONEXISTS is specific to an application, and COMADMIN_E_COMPONENTEXISTS is specific to a component in the application.
Retry and recovery
Use an update/reinstall procedure or remove the verified stale registration; blind retries reproduce the duplicate.
Practical administration scenario
A deployment reruns component installation without uninstalling the prior package and receives this duplicate-registration result.
Official Microsoft references
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