Unsure of Network Activity

Hello. I'm a new user, but have frequently been dealing with what i feel might be spyware, or something along those lines.

When I open Norton and go to Activity; Network Activity, I notice "into my Mac" several connections that I am not familiar with.

It seems when I disconnect these "computers" everything runs a lot better. Why would I have a "Windows file sharing" files on my Mac?

There are actually two that show up and after a few moments, I disconnect them and my computer seems to run better. Is this normal

to have a Windows file running on my computer? If not, how would I find and delete it?

I am running Norton 8.5.10 version. Build 9.

My computer is an I-mac with system 10.15.7; Catalina.

Many thanks.