Binaries are available for most platforms. Most users won’t need to compile MongoDB themselves. In addition every prebuilt binary has been regression tested. See the Downloads page for these prebuilt binaries.
MongoDB can be compiled for Windows (32 and 64 bit). You will need to have the platform sdk installed. The platform sdk can be installed manually. It comes with Visual (Studio) C++ as well.
SCons is the make mechanism, although several .vcxprojs and a .sln solution file are also included in the project for convenience when using the Visual Studio 2010 IDE.
There are several dependencies exist which are listed below. You may find it easier to simply download a pre-built binary.