Well a bit of a pickle.
First thing when we are talking about moving things to the hard drive we are talking about the data files (music, photos etc., ) not the applications. They are best left just where they are in the application folder on the main hard disk.
Second, you can get a copy of iTunes 7.7.1 for OS10.3.9 from the main apple website, go downloads, choose apple from the left box, then Ipod and iTunes. Itunes 7.7.1 is on the first page.
Rather than try to take you through each application and how to move its data file (iPhoto Library, iTunes Music, Garageband etc.) Go to this page
http://support.apple.com/kb/index?page=search& src=support_site.home&locale=en_US&q=Move%20fo lder.
This gives the instructions for all the main iLife applications.
Have a look through these and let us know your results.
Alternatively I am in the MK post code area, are you close?