Helvetica 83pv-RKSJ-H issue

Question

Hi all,
I know this is a question that's been asked, and for some it's been solved. However, after hours of reading forums and trying everything I've read, I still haven't been able to resolve this font problem. I MAY know what the culprit file is, but unfortunately, it is a file I have to constantly open! Here is my issue:
I use Helvetica in my Illustrator template for my freelance job, so now, hundreds of my files have been infected with this "helvetica 83pv-RKSJ-H" issue. Whenever I open a file that uses Helvetica, it says that helvetica 83pv-RKSJ-H is a missing font and will be substituted.
How can I go about getting rid of this error so that I don't have to fix hundreds of AI files? Also, I've read that people say to disable or remove the MM files, but my computer does not allow me to do this. Maybe I'm doing it wrong.
How do I disable/remove them, and will this stop the error from popping up every time I open a file?
I am also having this problem with MYRIAD. (I'm not sure if this is relevant, but I design t-shirts, therefore my files will be sent to printers. For this reason, I must use the default Helvetica, and not a version that the printer may not have). It would be much easier to have a solution that will eliminate the error message from popping up altogether, WITHOUT having to download that "helvetica 83pv-RKSJ-H" font, but I'm not sure if this is possible.
I am using Illustrator CS5 and OSX10.6.7. Thank you.

Answer 1

I outlined fonts that are not default fonts (the fonts used in the actual designs), but not the template, in which I used the default Helvetica. And the reason why I didn't outline the template is because prior to this issue, it was more efficient to not outline since I have multiple revisions to do for files. Often times clients would want their shirt name changed, or the Pantone colors changed, and it was quicker for me to edit the same file rather than saving an outlined and unoutlined file. However, it seems like that's what I'm going to have to do for now until I find a fix.
Yes, I am on an admin account. I'm not even sure what font I'm looking for. I've looked in the systems/library/fonts, user/USID/library/fonts/, and HD/Library/fonts, and have only found it in the systems folder. Again, I am unable to remove it, and if I open FontBook, I can't find the HelveLTMM or Helvetica LT MM fonts to disable. Tips?
(By the way, when I say I am unable to remove it, I mean that I can move it out of the folder and into the Trash, but cannot empty Trash. It says it is in use even though I have no programs open. But even when I move it out of the system's fonts folder, I still get the error.)
(More info [sorry for all the sidenotes]: Files that were created prior to this issue are also corrupted now. When I opened them while the "corrupt" file was open [before I knew which file was the culprit], they got "infected" with the non-existing Helvetica. I'm afraid that since I saved those files without knowing they were infected, my AI will continue to have that issue until all files are resolved, which is why I'm trying to find a way to completely wipe out whatever it is that is causing this so that that error won't pop up anymore, and my files won't look for a Helvetica I don't have, even though I had originally used my own default, working version. Not sure if any of that makes sense...this is all really confusing for me)