I installed JAVA and TOMCAT and i unzipped dimensionX now what do i do to start dimension X i tried opening the index file but none of the links in the file work. What should i do?

Check out the Installation manual for the detailed procedure:

http://www.dimensionex.net/en/go.asp?page=install

However you just need to start Tomcat and open your browser to:

http://localhost:8080/dimx

cheers