Ok,
So I had Reason 2.5 installed and was using it fine.
One day it quit, when I tried to reopen the program
a window popped up saying "please reinstall, cannot
find Reason engine"
So i reinstalled the program, and it still poppes up.

If anyone has advice or know what the Reson engine is
please help.

Thanks in advance.
Jobojaxson

Well, first of all, you can check to see if your Reason engine is indeed installed. Control-Click on your Reason application icon, click on Show Package Contents>Contents>Plugins. Inside the Plugins folder you should see your Reason Engine.plugin. If it's not there you could always try re-installing either the entire app or do a custom install if that option is available. If it IS there, I'm not sure what to tell you other than contact Propellerhead tech support. If you do so, at least you'll be able to tell them whether or not your Reason Engine is actually installed.

I hope this helps.