arduino control software

I require software to allow an arduino to read a usb signal from a pc running driving simulators and control a servos (either mechanical or digital) relative to the value of that signal. I currently have a program working with the simulator that provides the signal and a wheel and pedal set that receive the signal and display the reading on a digital speedometer. The servo's are required to control a high power circuit and digital servo's would allow for a simpler maintenance free setup that would be more robust.