Well, then I'd suggest you check Options - tags&Playlist - "Update tags when editing properties" ---> disable it.
This should prevent MM from changing anything in the tag in the file.

(But then afterwards should you ever want MM to update tags you would have to use menu command "synchronise tags")

Also, you may check out the Options - Library - "Infer track properties" --- there are different options to choose.

2.5.5x Gold

I use mostly MP3ext (http://www.mutschler.de/mp3ext/MP3-Info Extension) to tag by right clicking on the actual MP3 in Explorer which brings up Properties where I can do editing.
I also use MusicMatch Jukebox 10. I like the way I can view my library with Jukebox.
I don't auto-tag anything it's all manual editing.

This is very weired. Which version of MM are you using?

I've got 2.5.5.x and it doesn't do what you saying.

What do you mean by MM re-tagging?
Are you auto-tagging from Amazon maybe?

How do I stop MM from re-tagging all my albums and artists from The Album name/Artist name to Ablum name/Artist name, The

ex. The Beatles to Beatles, The or The Man Whould be King to Man Whould be King, The