EXS 24 Logic Sampler Users Group

Hi.
I have enjoyed this group for a while and have a question of a semi 
newbie nature. I was wondering if any one has a recommendation for 
keeping my exs programs and samples more organized. Sometimes I'll 
open an old song in Logic and I get the message- "junglebass1.aif 
not found" or something similar. I thought that by having a folder 
on my desktop of sampler instruments and by keeping sub folders of 
the samples associated with each program in there that I was safe, 
but something is still wrong. I thought I had a handle on it. Would 
I benefit from getting Translator or Redmatica Manager?
 One problem is I've had the same setup for years and don't have any 
upgrade plans in my near future. It is outdated, but works for me 
just fine:

Mac G4 Dual 500 1 GB Ram OS 9.1(yeah, I know I'm way behind the 
times!)

Logic Audio Platinum 4.1 with EXS 24(not MKII), but the original

I recently experienced a problem when I downloaded some cool synth 
stuff from the Hollow Sun site(an excellent resource and highly 
deserving of everyone's support). I took a cd of the programs and 
samples to my studio, put em on my hard drive in the aforementioned 
desktop folder and got the previously mentioned error message when 
trying to audition the new sounds. I tried looking at the factory 
sounds that came with the EXS24, but didn't really find a clue as to 
what I'm not getting.
I realize that the answer to my problems may lie somewhere in an FAQ 
and I've tried searching to no avail, but I was hoping for a super 
clear concise explanation from someone of how to keep my exs 
programs and samples organized before the mess gets any worse. 
Thanks.