Check your .Net version first. if its 4.5.1, then uninstall that, and install version 4.0 for 64 bit. Then reinstall version 4.5.1.
Since IFS client is a 32 bit application you will need to install 32 bit oracle client even though your machine is 64bit. Additionally you will need to install the runtime in a location other than the default location which is “C:\Program Files(x86)\IFS Applications” as the brackets in the path will lead to errors.