The reason why the fuse was melted is because there is a short circuit in your power window/lock wiring.
If you haven't done any repairs in your windows or locks, then one of the wires located at the hinge area (inside the rubber boot) on drivers door may have cracked and touching the body. Looking at the year, it is highly doubtful this may be the course but still possible.
Also, try this method: pull the door panel and disconnect the wire plug that is attached to the window motor and the locking mechanism. Insert a new fuse and see how it goes. Do this for all 3 doors (excluding the drivers door).
Let us know.