How to make Endnote X and Microsoft 2004 compatible?

I have Endnote X and Microsoft 2004. They used to work in my old labtop (I uploaded Endnote X and Microsoft 2004 early last year). But now they don’t talk to each other. I can open my endnote library in my new computer, but when I go to word tool, there is no endnote option. Does anyone know how to solve this problem? Thanks very much!