Click any of the following listed operating systems that corresponds to the operating system type installed on your system i.e. 32-bit or 64-bit operating system. It might be possible that certain operating systems are available only in 32-bit or 64-bit architectures, and if such is the case, it will be specified.
Microsoft Windows Server 2012 R2, Windows Server 2012 and Windows Server 2008 R2 Operating Systems are available in 64-bit only.
Microsoft Windows 2000 and its flavors, and operating systems released prior to Windows 2000 are only available in 32-bit architecture.