To install any program in Windows 8/8.1 you must be logged on as the Administrator The other profiles are not allowed to install programs in the Windows 8/8.1 operating system
What profile are you using when you try to install FTM 2014? (I never understood it, but even for single user computers, many insist on setting them up with Administrator profiles and User Profiles.)
Windows 8.1 as I understand can run on every thing from a cell phone, table, laptop to a desktop. However there are different types of Windows 8.1. as David Abernathy said above. It would help to know if you are putting it on a Desktop with the fastest processor available and X+ gb of ram, or you are trying to run Windows 8.1 on a cell phone or an IBM 386 machine.
I don't have FTM 2014 but have FTM-2012. My FTM 2012 is running on a Toshiba Satellite Laptop with an Intel I-3 processor and 4gb of ram. It is installed on a 500 gb disk. I have been successfully using this system for about 3 months now.