[Solved] SharePoint Illegal operation attempted on a registry key that has been marked for deletion

SharePoint users get an internal server error while performing a search.

This error appears for the Out Of The Box search site too.

If the stack trace is enabled, the message will contain information "Illegal operation attempted on a registry key that has been marked for deletion".

- Restart Search Query and Site Settings Service from Central Administration

- Restart the application pool for SecurityTokenService

- Reset IIS

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