I had this problem and resolved it. I posted a page instruction for others who have the same problem to follow. Then, someone else made a copy of it on another thread. So, you should be able to find either one of those copies. I don't remember the details or I would write it again. Just search under my ID. That is the only thing that I have posted. Hope it works out for you.
The most straightforward solution can be found in this blog, specially if you are using the SPSS student version (PASW 18):