Most usb ports are used for updating the firmware on the player. I looked online at your player's information and it says that the usb port is "For expanded connectivity options." A review for the player says "With a USB flash drive or an external hard drive you can watch WMV, XviD avi, H.264 MPeg4, and MKV hi-res files. This has become my favorite feature!" My guess is that it won't work with your usb wifi adapter. What kind of router do you have? Is running an ethernet cable not an option?