I am having a problem with the sysprep process loading the mass storage driver during setup. The issue happens when the system is installing the OEM drivers, a dialog box appears asking for the iaStor.sys file. If you click the drop down the location of this file is already listed, choose it, hit enter, and then the installation will finish. This is happening on Optiplex 755's and 760's. This does not occur on GX260,GX270, GX280, GX620, 745, 780. Obviously some of the older workstations do not have a mass storage controller but the ones in questions do. Short of this problem the syspreped image will load all other drivers on all of the models listed with out a hitch.