1997 Buick Lesabre car

Electrical problem
1997 Buick Lesabre V8 Automatic 140000 miles

I started my car and tried to let the windows down when I did that the car went dead. I tried to start it again it starts but goes right back dead. The fuel pump is not working so I think fuel pump is bad but that doesn't explain why when you turn the key foward the window's will not go down so that makes me think its something that controls fuel pump and windows