Melissa, here's the deal. If I can find my old 2002 OEM Disk I will send it to you FREE! I was in the same position as you and purchased a 2002 SC-430 and absolutely LOVE IT! I looked for an update on the net. Some guy in California was selling what I think was a OEM Copy and I bought it but I couldn't get it to work, so I had a friend of mine who owns a body shop get an OEM 7.1 Version from Toyota. I think my NAV Version from the original OEM Disk was 2.0 (but don't quote me on it) and I was trying to update my NAV from 2.0 to what I have now that is 7.1 what a difference. From what I understand 8.0 is the newest version which was released December 2008/January 2009. I can send you both discs and see which one works for you. Let me know.
Regards,
Blaise
WOW! Thats very kind of you! If you sent me a disc then at least I would have something to use & test mine out with...My email address is: melissavac7811@aol.com. I emailed a guy this morning from Craigs List and he cautioned me that most of the time the NON-OEM discs will not work and you need to purchase the genuine article. Did you say you purchased a Toyota one? Does that work on ours as well? Thanks again, Melissa