Well. Moviemaker actually could do this, but probably you did not make the right approach.

>one long picture moving left

If you need a long picture you could assemble a long picture, not a series of images.

Then you can use **Gimp** to assemble them and use Movie Maker with one of the panning movements it has.

But Probably you are looking for a compositing program.

A nice Free alternative is **Hit Film Express** and of course, you can use **Blender** too. Another free alternative is using Davinci Resolve's Dynamic Zoom tool.

That is if you really need a movie.

If you do not, because you need this on a webpage, you probably should use a **CSS animation**.