Compiler Error with API

SO i am using forger's winapi tutorial with msvc++ 2010 and whenever i use a msgbox my compiler says that the parameter are incompatible with LCMPR or something like that, all i did was copy and paste the code so that i can learn from it and i get errors. If anybody has a better tutorial i would appreciate it.

Post the portion of the code that's giving you errors and the actualy error.