My battery is always dead when I go to start my car. What could cause this?

My battery is always dead when I go to start my car.
And a fuse keeps blowing, either every time I turn the car on or off, Im not sure which it is. Everything is electric so the driver side seat adjuster dosnt work and the trunk dosnt open from the inside. Could the blown fuse be draining power from the battery even when I turn my car off?
Could it be the alternator? Or is there a short somewhere?
My friend looked at the wires and they look fine and the battery itself is fine.
Im clueless!