Hi:
The ODS GRAPHICS facility was experimental in SAS 9.1.3. I don't have SAS 9.1.3 to test with any longer, so I don't know whether PROC MODEL was "turned on" for use with ODS GRAPHICS in SAS 9.1.3.
(It's also possible, since you are using OUT= and OUTEST= that turning off the LISTING destination might have prevented some of PROC MODEL from working correctly. For some procedures, the LISTING destination needs to be ON for output objects to be created.)
But that is all speculation on my part. I don't think this has anything to do with Windows 7, I think you should work with Tech Support to find out whether you can use ODS GRAPHICS ON with PROC MODEL in SAS 9.1.3 or whether you need to install SAS 9.2 in order to get the production ODS GRAPHICS capability.
To open a track with Tech Support, go to this web site:
http://support.sas.com/ctx/supportform/createForm
cynthia