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Win7 must first be FULLY updated. Go to Windows Update and run it. Keep installing the 'critical' and 'optional' updates until you get the message "There are no more updates available". Then install these drivers > Desktop (full version) using a clean install > Clean Install AMD Graphics Drivers
Full version 17.4.2 now has been successfully installed.
Minimal version stops with message: "Not supported 16-bit version application -The function "CIMManifest.exe" cannot be started because of an incompatibility with the Windows 64-bit version".