My Phalaenopsis looks dead with only a few shriveled up roots, can it be saved?

[Gina Jacobs]

I've had my plant now for four years. I've never had to do much to care for my plant, until a few months ago, a friend replanted my phalaenopsis in bark material. Now I'm so confused. Now the plant has lost most of it's leaves and the roots have died as well. I watered the plant yesterday because I noticed the air roots were shriveled up.
Today the roots look unhealthy and like it's dying.
Can someone tell me if this plant salvageable?