While the native (retail) Navigator can be installed and run on a 64-bit machine Windows box, it is wise that you specify "x86" in your project's "Build / Platform target" properties area. Choosing "x64" or "Any CPU" may (will!) eventually cause you problems.
Our API is, and will most likely always remain, 32-bit.
This is a reminder to all developers: While the native (retail) Navigator can be installed and run on a 64-bit machine Windows box, it is wise that you specify...