I take the Steiner view on this Free Will thing. Yes, if you're looking at other people, you can't know whether they have free will. But when you examine yourself, you do have some level of insight into your own thought processes. How much freedom you have does largely depend on how much insight you have, but the point is, the difference between a mechanical process happening without your awareness, and our will, is that in the latter case, we can observe it, think about it, and change it.

That's Free Will. The fact that there are subconscious influences is almost irrelevant. The important aspect is that it is self-reflective, able to understand and change itself.