This driver is needed if you use a Thrustmaster's T500 RS and want the FFB working correct.
http://ts.thrustmaster.com/eng/index.php?pg=view_files&gid=1&fid=2&pid=316&cid=15
http://ts.thrustmaster.com/eng/index.php?pg=view_files&gid=1&fid=2&pid=316&cid=15