This isn't really a help forum, and did typing SW instead of software really save you a lot of time? It made your post a bit confusing because at first I thought you were talking about a network switch. For future questions like this, you will probably want to ask in /r/techsupport/ or another help based subreddit. This is a professional subreddit for people who are actual sysadmins.
To your question, you could get a firewall and configure it to alert you for incoming connections. I haven't used windows for a while now, but something like Zonealarm probably does want you want it to.
>How did they find out my email addresses in the first place.
All it takes is autofill enabled in the browser and scripts will do the rest.
> Just unticking the tick in properties doesn't really work.
That is is just for remote support, it has nothing to do with network connections.
>How to secure my Windows 10 from remote connections?
A firewall, like: https://www.zonealarm.com/software/free-firewall
The paid versions of Kaspersky have their own HIPS, Application Control, and it doesn't have any negative effect on performance. You could give Comodo's a go, see if it causes any slow down or issues, and then disable it if so.
Comodo's firewall with an AV shouldn't cause any compatibility issues, though you can add each to the other's exceptions and trusted programs lists to make sure.
ZoneAlarm is still developed, yes. Its most recent update was at the end of July - https://www.zonealarm.com/software/free-firewall/release-history
A different kind of firewall implementation would be something like SimpleWall or TinyWall.
KSC-Free with Comodo Free Firewall is a great combination, and actually has a benefit over paid Kaspersky products - Comodo's auto-containment (sandbox) feature. Of course it also comes with the disadvantage of having to install and maintain 2 security products instead of 1, so it just depends if you feel that is both something you can do, and is worth your time.
Many AV products now include a firewall as a part of the protection.
If you just need a firewall, I used zonealarm free a few years ago and it was quite good.