What worry me is not so much the "AUTO" part but rather the green check mark for "Trusted Internet".
I found in this forum an answer about this setting (from guru GeorgeV, august 2008) that svchost.exe should allow Trusted Server Rights, but no Internet Server Rights.
But this may be different on my computer. Why else would I keep getting the green check mark for "Trusted Internet"?
I intend to just let ZA do its work now for the learning time (3 weeks) and see what happens. After all, ZA has worked well for me for years.