Solution From Tech Support at Microsoft tech support....
http://www.mvps.org/winhelp2002/hostsvista.htm
But you need to be patient.
I did this on Friday and the "prompting" problem persisted all weekend.
Suddenly on Monday the nework prompt went away and has not returned for two
days. Tech support told me today the it may take as long as 72 hours for the
procedure above to work its way through the computer based on number of files
and extent of computer use. I must admit I don't fully understand this
explanation but there you go.
Hope this solution works for all of you.
Senior Bit