VSS_E_PROVIDER_ALREADY_REGISTERED: meaning and diagnosis

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Description:

The VSS provider is already registered. Do not add the same provider identity again.

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VSS_E_UNEXPECTED	VSS_E_PROVIDER_NOT_REGISTERED

VSS_E_PROVIDER_ALREADY_REGISTERED

VSS_E_PROVIDER_ALREADY_REGISTERED means that VSS already has a registration for the provider identity being added. Registering the same provider again can create conflicting assumptions about provider ownership and setup.

How to investigate for VSS_E_PROVIDER_ALREADY_REGISTERED

List installed providers and compare the provider GUID with the one being registered.
Use an upgrade or repair path supplied by the provider vendor instead of registering a duplicate entry.
Remove stale registrations only with the provider's documented uninstall or recovery procedure.

Microsoft: VSS providers and administration

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