java wont install on a brand new mac.

This is a brand new mac and there do not appear to be any previous versions of java installed. When I download Java 7 from oracle

as per the instructions here:

http://www.java.com/en/download/help/mac_install.xml

downloaded from here:

http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-j avase7-521261.html#jdk-7u45-oth-JPR

No joy. it just stops working on the install step. (no errors, it just doesn't respond).

I've tried installing this which also doesn't work (exact same result - does not respond on the install step):

http://support.apple.com/kb/DL1572

on all the other support tickets regarding problems installing java, the above two resources were repeatedly referred to, but they do not work for a new mac with mavericks installed and no previous version of java.

Please help.