[Dev-C++] Compiler Problem

I both have Dev C++ 4 and 5 and both of them don't work. With Dev C++ 4, whenever I compile, I see the compiling error, g++ installation problem, can exec 'cpp'. No such file or directory. For Dev C++5 the compiler displays C:\ Dev Cpp\ include\stdio.h with message type specifier omitted for parameter. What could be the problem and how can it be fix?? Thanks.