First off, try using Dif Gel remover. This is a gelatinous stripping solution that you apply with a brush or roller. Apply it an allow to set for several minutes, then see if it will work. If not then try renting a steamer.
I'm personally not fond of steamers, but sometimes they can remove wallpaper without too much damage. There will always be some damage when you strip wallpaper, how much depends on how well the installer preped the walls. Resign yourself to doing some repair.
If the steamer doesn't work, consider hiring a pro.
Stop back again, as I'm sure someone else here will have other suggestions.