Before you spend too much time on F12 be aware that it is at EOL(end of life) and there will be no further updates for it of any kind. Fedora only supports the two most current releases, currently F13 and F14. Effectively this means that one has to do a fresh install once a year(to run Fedora effectively).
Whenever you ask a problem please help us help you by doing a few things. What distro, version, and arch are you running? F12 32bit or 64bit? Tell us specifically what issue you are having. What is the serious issue with flash? Wireless printer?
As far as loging in as root user, Fedora no longer allows this(in gui). Login as a normal user, open a terminal, and su - (su space dash) into root. You can do anything that way that you can by logging into root directly and it is much more secure.