Did not suggest you buy a new PC (although if you started with Windows 7 your computer is around ten years old if you bought it when 7 first came out and that is ANCIENT for a computer). You could always invest in a MAC. (I wouldn't touch the things but you might prefer them).
I mean, seriously: if you don't like a product why keep using it? Trade it in for something you DO like.
Microsoft makes Windows 10. It is designed, as a service, to provide continued updates and improvements. If this is not what you want you can go MAC. You can go OPEN SOURCE. There are many other choices.
All that your changes are accomplishing is to void any protection you might have gained via the Windows Defender Security Center and the protections (including, but not limited to) Antivirus that it provides,
Our conversation is over.