USB Module in 4550 can be used in different classes.
To keep things simple search code for HID class in PIC. Microchip Has example code.
Then read ADC and convert to BCD and then to ASCII and then to USB.
But Hyperterminal, It is for serial port. If you want PIC to work as USB to serial I think CDC classs is the way to go. Not sure anyway.
All the best
Roy Thomas