Learn how to remove an instance of SQL Server from the SQL Server Utility. You can run a PowerShell script or use SQL Server Management Studio for this task. To use PowerShell to remove a managed ...

To update or remove a [!INCLUDEssNoVersion] failover cluster, you must be a local administrator with permission to login as a service on all nodes of the Windows Server failover cluster. If you ...

If not, just remove SQL Server 2008 R2 and select the instance you are trying to install (Don’t remove anything else). If it’s not there, then leave it and let’s go to the next step.