Windstar Is Blowing Smoke Through The Exphaust Pipe And It Smell Like Antfreeze,what's The Problem?

It most likely has a blown head gasket.

My brother-in-law had one of these vehicles, a bit older than yours, but it was the O-rings. Once he got those fixed this awful smell stopped as well as the smoking.

if it smells like oil and the smoke is black it is th o-rings. If the smoke is white and smells like antifreeze it is either the head gaskets or the block either way you have a serious problem. You can put some lucas in it for the o-rings.  They sell it at auto zone. Or if it is you head gaskets you can use some stop leak and that is also sold at an auto parts store. This will temporarly slow the problem down but will not fix it.  You should have this problem fixed and it is very expensive either way.

I Changed the head gaskets, but it is still blowing white smoke.