Dennis, just upgraded to 9.1.3 on a W7 machine, and received this error during the install.
[img=http://s720.photobucket.com/user/w5ga/media/Capture.jpg.html]install error[/img]
And when I try to run Logic, I get this now:
[img=http://s720.photobucket.com/user/w5ga/media/logic%20error.jpg.html?sort=3&o=0]Logic error[/img]
73 Doug W5GA