What should I do if sqlserver cannot be deleted and cannot be reinstalled?

The problem that SQL Server cannot be reinstalled due to unclean deletion can be solved by the following steps: manually delete files and registry entries; use SQL Server installation and uninstallation tools; use third-party uninstallation tools; check Windows Event Viewer; Restart the computer; reinstall SQL Server.

How to deal with the problem that SQL Server cannot be reinstalled due to incomplete deletion

Problem: SQL Server is not cleanly deleted and cannot be reinstalled.

Solution:

1. Manually delete remaining files and registry keys

• Navigate to C:\Program Files\Microsoft SQL Server and delete all related folders.
• Navigate to C:\Program Files (x86)\Microsoft SQL Server and delete all relevant folders.

• Open the Registry Editor (regedit) and delete the following subkeys:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server
  • HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SQL Server

2. Using SQL Server Installation and uninstallation tool

• Download SQL Server installation and uninstallation tool: https://www.microsoft.com/en-us/download/details.aspx?id=35539
• Run the tool and select the "Remove" option.
• Follow the prompts to complete the deletion process.

3. Use a third-party uninstall tool

• Consider using a third-party uninstall tool, such as IObit Uninstaller or Revo Uninstaller.
• These tools can often remove software more completely, including leftover files and registry entries.

4. Check Windows Event Viewer

• Open Windows Event Viewer (eventvwr).
• View the Application and System logs for errors related to SQL Server removal or installation.
• Take appropriate corrective actions based on the error message.

5. Restart the computer

• Make sure to restart the computer after deleting all remaining files and registry keys.
• This will refresh the system and ensure that all locked files are released before reinstalling SQL Server.

6. Reinstall SQL Server

• After restarting, try to reinstall SQL Server.
• Make sure to use the latest version of the installer and follow the prompts in the wizard.

Note:

• Please be careful when deleting remaining files or registry keys to avoid damaging other software or system settings.
• If you encounter any problems, please refer to the SQL Server documentation or ask Microsoft Support for help.

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