i think you misunderstood.driver install will take place in the device to which it is connected which in your case is D-Link.unless D-Link DSL-2520U comes with inbuilt drivers for LEO-NANO150N which is most certainly not the case it will not work.usb ports in modem/router usually support only pen drives & 3g usb modems(that too from a specified list & not just any 3g usb modem again because of fixed inbuilt drivers in modem/router) & nothing else.if only creating hotspot is your aim then you can simply connect wifi adapter to PC & use connectify free version for basic hotspot features.procedure is very straight forward & for help you can see instructions on connectify web site/help/faq.