try to shut off Nvidia shadow play if you installed your drivers with geforce experience (and disable any shadow play sharing)
and try again
also if you just installed it via Steam make sure you install the updated version of the Uplay Client from the Uplay website
Steam will install an older outdated version of Uplay with the game
see also this page and look at solution #4 which covers several backround applications that can be a problem
http://forums.ubi.com/showthread.php...ped-Responding