Disable Skype Autostart via Task Manager
Fortunately, the latest versions of Skype now work like normal application Windows. You can not use Skype's built-in option to turn off auto-start without logging in first, but you can turn it off via Task management.
To find this option, press Ctrl + Shift + Esc or right-click on the taskbar and select “Task Manager"
Click on the tab "Start“. If you do not see tabs, first click on “More details"
Search for "Skype" in the list, right-click and select "Deactivation“. Windows will no longer open Skype automatically.
How to remove Skype from notification area in Windows 10
If you have the latest Skype application installed on your computer, the above instructions will not create you problem. If not, follow the instructions below for the older version of Skype.
In the older Skype application, you could not just right-click on the Skype icon and close it like a traditional application. Skype does not give you this option.
Its oldest Skype application Microsoft does not even appear in the list of startup programs, so you can not turn it off in Settings or Task Manager.
However, you can hide the icon from the Skype settings window. Right-click the Skype icon in the notification area and click “Settings”Or open the Skype window, click the“… ”menu button and click on“ Settings ”.
Click on the category “Generally”And deactivate the option“Show Skype in the Windows notification area (system tray)“. The Skype icon will disappear.
Note that users can still send you Skype messages if you are logged in, even if Skype does not appear in the notification area. To stop it, log out of Skype. Click the "…" menu in the Skype window and click "Exit" to do so.