what do you mean, you can't access the HD when you boot from the OS X install CD?
Something's not right, bro... you should go straight to the Finder, only have the "CD" desktop wallpaper... yah it'll pop open the folder for the CD... but you should still be able to get to the other drives on the system. Once the Finder is up, you should (cross fingers) be able to swap disks and run Norton.
If you need a secondary CD drive, let me know. I'll see if I can't arrange bringing over my external CD-RW drive (it's USB and therefore slower than ****... but it'll mount and be visible...