87 300 Dt

[Demi]

Hi,

I just got a 87 300 DT. I drove it for about 3000 miles without problems.
When I arrived home, I placed the transmission in parking. I proceed to
close the windows. I pressed the windows switch and for about 1/2 sec
the window pane start to go up. Then stoped. I pressed the switch again
and the motor wouldn't move. Again, I tried the other window. The same
happened. I tried the sunroof. It wouldn't move. Then I noticed that the
warning light had come on. Stopped the engine. Then tried to start the
car again, and no panel lights. Nothing. Called the AAA. They jump started
the car. No problem. But now, I had no head lights, the windows still not
operating, and neither the sunroof. I drove home with AAA following me.
What could have caused the problem and how do I fix it?

Thanks,
Demi