RSAT missing DNS Server Tools?

I had a similar problem in that I couldn't connect to the internet because computer would not recognize the existence of a DSN server.--had Microsoft on phone for almost 3 hours no results.  Call my internet server company "Spectrum"  They sent someone out in 10 minutes he had me up and running. Changed a wire to my modem (thought lightening might have run in) but modem was on a circuit breaker.  He then downloaded files from main office to re-establish the DNS service to my desktop. I have lost other things doing Windows10 updates.  I have come to be suspicious of every update.  Now I'm getting a picture "that it is time to update my computer" and there is no company, product, or connection connected to the notice.  Nor is there a decline button.  I'm perplexed so I'll stop here on go work on that problem.  Any suggestions please post.