New car, New problems

Just purchased a 2006 armada le this evening,
When the salesman showed me the car he couldn't
get the navigation to work, none of the navi menus worked
(could not select them) he tryed another dvd and got it work,
so he gave me that dvd. All was good driving home navi worked
great. When I got home I shut the car off went inside to get
my girlfriend and go for a ride to show her the car,
Now navi not working again, when I start the car it doesn't
even show me the warning message just goes to radio.
She also noticed the clock doesn't change always says 8:00,
Then she wanted to ride in the back to watch a dvd.
while were driving I noticed that the passenger air bag off light
on the radio console was not on. Shouldn't the light be on if no
one is in the passenger seat?
Car has only 55 miles and all these problems already,
don't want to see what happens at 1000 miles.

Sorry for the rant no one here to yell at, The dealership will
get an ear full tomorrow morning.

Thanks for listening
Phong