You have to make sure that the Skype version you are using is compatible with the windows 10.
Run the installer in a standard way and once prompted, close the browser.
Right-click on the installer and open Properties.
Select the Compatibility tab.
Check the “Run this program in compatibility mode for” box.
Select “Windows 10” from the drop-down menu.
Right-click on the Skype installer again and click “Run as administrator” in the contextual menu.
Uninstall and reinstall Skype for Windows 10.
1. Fire up the Start Menu,
2. open Settings > Apps and search for the Skype app. Right-click on the app and select Uninstall. … Once you finished, restart your computer, then launch Skype for Windows 10 again.