Can you describe what's happening, in detail? What are you doing? Step by step.
You haven't really said much beyond "it's not working" so I can't even begin to guess what went wrong.
So, i uninstalled and then re-installed MBII, same message is popping up.
I deleted the .dll files in the MBII folder but when i'm launching the game, they come back automatically so the same message is popping up.
I did a check on the game's files with steam by going in the proprieties of Jedi Academy, same message is popping up.
I did that again but instead of launching the game, i deleted the .dll files after doing the check but, same message is popping up.
I did another check but this time, i repaired the installation in the MBII launcher, same message is popping up.
That's all i did, if you have another advice, please tell me.