SQL instances still remain after uninstalling

Alvaro_Arancibia_P 1 Reputation point

I carried out the uninstallation of SQL server on my computer including the instances. When I reinstall SQL server they keep appearing. How can I permanently remove them to reuse the default instance name?


Thanks in advance

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  1. CarrinWu-MSFT 6,811 Reputation points

    Hi @Alvaro_Arancibia_P ,

    Have you run setup.exe as administrator? The error code: 0x84BB0001 occurs under the following scenarios, so please make sure there have enough permissions to install SQL Server. You could get more details from this link.

    1. Remnants of previous failed SQL Server installations still exist on your computer.
    2. SQL Server installation is corrupted, you may need to download the SQL Server media again, and try install SQL Server again.
    3. The user did not have the permissions to access the register, you can grant full permissions to below registry keys to the setup account and SQL Service account.
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\120\

    Best regards,

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  2. Matthew H. McKenzie 1 Reputation point

    I find that Services are still listed in services.msc after removal. Of course they cannot be started. The only real solution seems to be a ground up re-install of the platform without MSSQLServer.

    In addition, upon a re-install we are presented with "One or more SQL Server 2019 CTP 3.x instances detected. To install a second instance, click Accept. To perform and in-place upgrade to the new CTP, click Previous, then Custom."

    So nuking from orbit seems the only way.