libusb for fpga & Qt in windows

Hi all
I under design a printer that a fpga spartan6 is main board and for
connection to PC ,I use a usb to uart controller(CY7C64225).now I can use
libusb for driver connection between fpga and PC?
I read befor for driver fpga to PC need to kernel driver so my question is
libusb need a extra code for my board or no?
for connect between Qt(windows7) and board any one have a example code?
I use a board that have driver but a lot of files but when I download
libusb have not is files.of course some files is special for any Ic ,now I
need special files .inf , .sys for my app?
sorry for poor English and a lot of question.

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