I'd love to know what the rest of this error message is.

I've been using PostgreSQL on Mac OS X for a few years, but now I'm trying to
install it on a WIndows computer so someone else can use it, and I'm getting
the following error message when I try to advance beyond the "Service
Configuration" screen in the installer:

"Your local 'Administrators' group contains 'Authenticated Users'.
This is a common configuration error that causes security issues. For this
reason, Postgr"

That's it. Apparently the whole error message doesn't fit in the error dialog,
but there's no way to resize the window.

Does anybody know what the rest of this message might be? Bonus points if you
can explain what it means, and especially if you can explain what to do about
it.

I suspect this is more a WIndows problem than a PostgreSQL problem, but I'm
afraid I don't know that much about Windows. I'm a Mac/Unix kind of guy, and I
try to avoid using WIndows whenever possible because this kind of stuff always
happens.

Thanks!