How do I compile my C++ Source?

I have source that will compile fine in Visual C++ 6 but it fails in 2005 or 2008 express. I've tried 2003 toolkit, Codeblocks, boarland 5.5 and turbo and nothing will compile it except Visual C++ 6. The problem is, Visual C++ 6 is $200+ and I am not a developer, I simply wish to run this SVN code that requires Visual C++ 6 compatible compiler. Where can I find a free one?