Depending on the version it can be slightly different, but in the user-startup file there should be a line like
Assign toaster: dh1:somedirectory
Where dh1: is the name a of drive where the software is and somedirectory is the directory where the toaster software is. It appears this is pointing to the wrong place. Use the editor, fix it, reboot and see what happens.
-Tig
