Installation Master for ERP 6.0 SR3

Hi Experts,

I want to install ECC6.0 SR3 on Windows 32bit OS.

I have downloaded the Installation master, But its not showing SAP SYSTEMS in the drop down menu. As to install the central system..

Its showing

SAP ERP 6.0 Support Release 3

-

> Rapid Configuration

-

> Sowtware Life-Cycle Option

Instead of

SAP ERP 6.0 Support Release 3

-

>SAP Systems

-

>Additional Sofware Life-Cysle Tasks

As in all the drop downs in Rapid Configuration & in Sowtware Life-Cycle Option

I dint find SAP Systems..

What is the procedure to install the cental system in this case.

Thanks & Regards

Injamuri