Note: This procedure requires editing a registry value; do not attempt this if you are not familiar with working with your system registry as a mistake can cause serious problems with Windows. Start Regedit and use the "Registry/Export Registry File" menu option to create a backup copy of your original registry. Find the registry entry "HKEY_CURRENT_USER\Software\Bullfrog Productions Ltd\Dungeon Keeper II\Configuration\Video". Expand the "Video" section. Double click on the "HighWalls" option and replace the value "1" with "0".