Installation guide and download link of Windows 7 / Server 2008 R2 SP1 is shown below; please refer to the installation guide to perform the installation.

• Installation guide and Download https://www.microsoft.com/en-US/download/details.aspx?id=5842
  ( This page is provided by Microsoft )

Note: To determine your system is "32-bit" or "64-bit", please press "Start" and right-click "Computer" and then select "Properties." The system type "64-bit Operating System" or "32-bit Operating System" will list on the window.