The first thing you must ensure that when you open the Logitech when did you get an error or not? If you get no errors after double-click the program icon, then I think that your firewall may cause this problem. First, you must open the firewall and after that you have to verify that the software Logitech webcam is not blocked. If it is blocked, you must allow the software firewall and after that try to open the webcam software Logitech. I think after doing this trick your problem will be solved.