Immediately it sounds like you might not have the same password as entered at install for your user account
Although if you are seeing other errors at boot it may not be that simple.
What version are you installing? The latest F17 or older version?
Did you install on a clean harddrive or are you dual booting.
Is this a fresh install or upgrade from previous version?
A little information about your particular hardware would be good too - as there are a few "quirks" when it comes to some graphics hardware.
It is frustrating when an installation does not work out the box - but you kinda need to help yourself a little more by providing a little more detail about your setup before more sane answers come your way