SP1 of Windows 7 is mandatory for installing any ArcGIS Product on Windows 7 platform.
Also ensure Microsoft .Net Framework 4.5 or later is also installed.
ArcGIS Desktop 10.5.x system requirements—System Requirements | ArcGIS Desktop
SP1 of Windows 7 is mandatory for installing any ArcGIS Product on Windows 7 platform.
Also ensure Microsoft .Net Framework 4.5 or later is also installed.
ArcGIS Desktop 10.5.x system requirements—System Requirements | ArcGIS Desktop