1. I don't think Microsoft ships IE9 with a google homepage. That must be something that you did yourself or that got transferred from IE8.
2. If you don't know how the IE9-beta works, either try to find out (via google maybe) or don't use it and go back to IE8. It's only a beta, you know. I googled IE9 MENUBAR for you, and the first hit was
Does that help?
3. How did you turn off the password?
4. What happens if you change it to something and then immediately change it back to nothing?