How do I enable Integration Services (SSIS) in SQL

I cannot start SSIS in SQL Server 2008. Here is a screenshot of SQL Server installer. Where should I begin to enable/install Integration Services in SQL Server 2008?

Here are the screenshots of installation steps taken using SQL Server 2008 R2 installer. The steps listed below should give you an idea to install necessary components of SQL Server 2008.

On the SQL Server installation media, right-click on Setup.exe and select Run as administrator.

On SQL Server Installation Center, click Installation and then click New installation or add features to an existing installation.

Click OK on Setup Support Rules step of SQL Server 2008 R2 Setup. If there are warnings or failures on Setup Support Rules, take necessary actions to fix them.

Click Install on Setup Support Files step of SQL Server 2008 R2 Setup.

Click Next > on Setup Support Rules step of SQL Server 2008 R2 Setup. If there are warnings or failures on Setup Support Rules, take necessary actions to fix them.

On the Installation Type step of SQL Server 2008 R2 Setup, select either New installation or add shared features or select Add features to an existing instance of SQL Server 2008 R2 and pick an appropriate instance name. Click Next >

Enter the product key on Product Key step of SQL Server 2008 R2 Setup and click Next >

Check I accept license terms, if you choose to accept the terms and conditions and click Next > on License Terms step of SQL Server 2008 R2 Setup.

Select SQL Server Feature Installation on Setup Role step of SQL Server 2008 R2 Setup, click Next >

On Feature Selection step of SQL Server 2008 R2 Setup, you need to decide what you would like to install.

If you need only the Business Intelligence Development Studio for SSIS packages development, then install only the Business Intelligence Development Studio.
If you need the Integration Services to deploy and run the SSIS packages, choose Integration Services. NOTE: I would recommend reading Licensing requirements on MSDN or Microsoft website before you choose this option.

Below screenshot shows BIDS installation for SSIS packages development and other client only components.

Read the details and click Next > on Installation Rules step of SQL Server 2008 R2 Setup.

Read the details and clickNext > on Disk Space Requirements step of SQL Server 2008 R2 Setup.

Read the details and click Next > on Error Reporting step of SQL Server 2008 R2 Setup.

Click Next > on Installation Configuration Rules step of SQL Server 2008 R2 Setup. If there are warnings or failures on Installation Configuration Rules, take necessary actions to fix them.

Verify the components and click Install on Ready to Install step of SQL Server 2008 R2 Setup.

Once the install is complete, the status wizard will appear. Click Close if everything is successful else take necessary action if the install fails.

Hope that helps.