NIS 2017- How to Trust... another non-networked computer on same Router?

Win7 cable internet, with no WiFy. NIS on backup laptop computer, and Buggy ESS AV on desktop computer.

After making NIS settings... changes- I Don't see a NIS "Background Tasks Updating..." pop-up, until After I've Restarted my desktop 3-times (both after a cold startup). What a time-consuming Hassle!   :o(

Would it help if I somehow... Trusted my ESS desktop, on my NIS laptop, or...?

Please provide a procedure?