Is this the controller you are trying to use?
http://www.hobbylinc.com/htm/ceh/cehcn2002.htmIf so, it is indeed a USB unit sold with a helicopter model and simulator, and as such, should be usable for FMS - when all other requirements are present.
So, it's time for as much info regarding your system as possible, i.e., make, operating system, processor, ram, graphics processing hardware - Nvidia, or Ati. To find this info, go to start/programs,accessories/system tools/system info/, under system summary, look at components. Or, if you can access the control panel, go directly to system. I'm using win7 so your OS may have these items in different places, or with different names, but this information will make it possible to determine what is needed to get FMS up and running on your machine.