Uninstall old
ERA6QOES Application
Microsoft SQL Server 2008 R2,
Microsoft SQL Server 2008 R2 Native Client,
Microsoft SQL Server 2008 R2, Setup (English),
Microsoft SQL Server 2008 Setup Support file,
Microsoft Sql Server Brower,
Microsoft SQL Server VSS Write
One by One
(If already Uninstall ignore it)
Then Delete all folder Present inside Local disk C:/inetpub
Then Install QOES Demo