Try uninstalling the drivers. Clear all remnants manually. When you reinstall be sure to close all other windows and any programs that don't need to be running. Follow the directions and plug in the USB when asked.
If this fails, groan inwardly and maybe clench your fist. When you've done this look on the back of your adaptor for the model number (mine's a F5D7050).Google 'Belkin driver adaptor 'model number'. This will take you to Belkin's drivers page. Download the driver from the site and try again. Good luck!