OK - Incredmail may have left some unwanted files on your PC. It has form.
How is your PC connected to the internet - via router and Ethernet cable to an Ethernet adapter on your PC?
Try: right-click on Windows “start” icon - Network connections - Network Troubleshooter.
Take a look here and try some of these help suggestions.
Google “incredimail uninstall windows 10”
Look here: PC Hell: How to Uninstall Incredimail Automatically