Need help on design of micro-controller with USB

Hi...

I'm looking for someone to help me design a micro-controller that can connect up to a USB port on a PC (Windows) and obtain a text file (notepad) that will contain a list of variables and values that I will provide.

Once that data file is obtained by the micro-controller, it must be stored on it and then it will be disconnected from the PC and connected up to a modem that only has a USB port.

Upon a triggered input to the micro-controller, it will send "AT MODEM" commands out the USB port over to the modem. Exactly what it sends out, depends on what variables were filled out on the data file.

I'm not a programmer...so be gentle.