Log Message:
-----------
Don't check group Power Users on Windows XP Home, because it doesn't exist.
Along the way fix a couple of typos in error messages.
Modified Files:
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pginst/ca:
user.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/user.c.diff?r1=1.12&r2=1.13)