Oracle Installation Issue - RESOLVED

Turns out it was a language setting in the operating system (Windows XP Pro, SP2)

My operating system was set to English (Australian), and Oracle hangs on install because of that. I reset the locale back to English (United States) and all was fine.

Which is seriously stupid, not that it is a limitation, but more the fact that a major software application deals with the problem by effectively hanging.

My thanks to this article here: http://forums.oracle.com/forums/thread.jspa?threadID=326124&tstart=0