Freehand 11.02 won't start up

All of a sudden when trying to open Freehand it asks for my password and when I

type in password it won't open, just keeps asking for my administrator 
password. I am the administrator. I tried to re-install and it says I must 
unmount the idisk and I can't seem to do that. Any suggestions as to what is 
going on here? It was working fine.

 Thanks:disgust;