Check your computer for any gameplay capturing software, i. e. Plays.TV, Shadowplay, Raptrt, Xsplit Gamecaster etc. Disable or delete them. To do so, use the following steps:
1) Check if any of abovementioned programs is installed on your PC. They should appear on taskbar or in “Processes” tab of Task Manager as:
2) Close the application(s)
This applies to both nVidia and AMD cards.