Go to your local Home Center or Wallpaper Retailer and pick up some DIF. Before you do anything, lay out some sheet-plastic around the base of the wall(s) and then throw some newspaper sheets on top (to absorbe the water). Read the Directions on the DIF container BEFORE you leave the store to see how much you'll need. Measure the sq. footage of the room and bring that 'number' w/you to the store. Also, try to find yourself one of those HUGH carwash sponges. Also, buy a pair of 'thick' plastic gloves because you'll be working with VERY HOT, BOILING water in this process. In short, it sounds like you need to wash the walls to get the glue off. You may need to do it a couple of times. When you've cleaned the walls to the best of your ability, use a good Primer/Sealer like BIN. THEN, you can do what you want (re-paper or paint.) If you're painting, be sure to use a paint that has a Mildewcide already in it.