I hate to be the bearer of bad tidings....but your plant has a bad case of brown rot. If there are any pbulbs with no brown on or near them, you may be able to save a piece of this plant. You need to cut anything and everything off that is brown. If a pbulb is brown even a tiny bit at the base you must cut it off completely. If all the bulbs are affected you need to throw it away. If you are able to save a portion of the plant, you will need to treat it with a coctail of fungicide and bacterial killers. When you are done cutting you will need to thoroughly steralize your cutters. And you will need to keep the surviving piece away from your other plants. You will not water for a couple weeks...keep moisture away from this plant. Any dripping from this plant onto another plant will spread this bacteria and you will lose other plants. Good Luck....keep us updated. I hope this will help you save a piece of your orchid.