Yes, if you can explain the problem you are having, that will help a great deal. I  had Poser 5 and don't recall having problems with the hair. Also, if it's a problem in rendering or fitting it, maybe you can post a screenshot of the results?

I am currently using Poser 6 and I am having the occasional problem with some of the hair in this version, specifically the Updo which I found I had to go into the Material Room and click "Inverse Normals" and "Reflection Lit Mut" in order to be able to render without huge black splotches.  But as I said  that was a problem in Version 6. The hair worked well in Poser 5.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi