Does the 4 reinstalls thing apply if I just reformatted my hard drive?
Max 7 is still very similar to max 4. It has several new and redone features and some of the controls on the default interface have been moved around (for example, the snap button is on the top toolbar instead of the bottom). However, everything needed to make starships and space stations is still pretty much the same. Some of the new features on max 7 are the preserve UVs tool, bridge tool, paint deformation, normal bump maps, surface scattering, pixel-based camera mapping, skin morph modifier, renderable spline modifier, and smart object culling to name a few.