you mean I just follow the directions?

So I've installed cygwin before and had problems with groups and permissions. It prints out a nice message saying run 'mkgroup -l -d > /etc/group' . In the past I couldn't get this figured out.

Well, it actually works. The catch is, you need to be logged in as the domain adminstrator.

So if you're on a domain at work, ask your IT people to login and run mkgroup and mkpasswd for you on your cygwin machine. You'll be much happier.