i know all you need is a compiler, though have you tried Visual C++ 2008 Express . There is a way to add x64 compilation (instead of Win32).
THe other way to do this is to use g++ for windows, there is a switch for 64 bit compilation.
Speaking truth I am very new in the world of programming.Can you just tell me what a G++ is??Is it a compiler for C++??Whats the difference between a compiler and IDE ??