I have been working on usb OTG protocol of MCF52259RM coldfire family controller. Using this protocol to communicate with PC having Windows 7 O.S. Drivers get detected whenever i plug it, no error is observed in device manager. But when I try to program controller using USB I am unable to access my product using PC application software. This software and drivers for USB work fine with WindowsXP , but with Windows7 it has got problems . Please can anyone help me to solve this problem.Is there any difference in windowsXP and windows7 usb protocol that I should take care.