Remove crashed SQL Server 2005 Express installation

If u cannot uninstall the instance of SQL Server 2000 Express installation by general methods, u can try the following steps:
1. Backup all ur data.
2. Stop and then delete all SQL Server services.
sc delete mssqlserver
sc delete mssql$sqlexpress
sc delete mssqlserveradhelper
sc delete sqlbrowser
sc delete sqlwriter

3. Delete the local security groups for the SQL Server 2005 componments.
4. Uninstall VSS Writer, Native Client componment, and Setup Support Files componment.
5. Renamed/Removed the installation folder.
6. Run Install Cleanup utility and delete all SQL Server 2005 list items.
7. Restart computer.

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