Richard, hi neighbor. No other computers using my line in my home.
The advise to active my XP firewall, plus unclick "notify me..." may have fixed the problem. I had previously done this, but possibly XP required that my computer be restarted for these setting changes to take place.
I have not had any more "alerts" since rebooting.
With fingers crossed,
Thanks all. Pizza and vino is on me.
Check 6
Naples, Italy = where pizza was invented