Lua is a light-weight scripting language needed to run certain quests written in Lua. This will need to be installed in conjunction with the Boost C++ libraries in order to run Lua quests.
Homepage: [Lua] (http://www.lua.org)
Current Version: [5.1.4-46] (http://luaforwindows.googlecode.com/files/LuaForWindows_v5.1.4-46.exe)
After installation, copy your lua51.dll into your server root folder.