That didn't help.
I've done a bit more testing stuff. Here is the DP_Install_Tool.log from one of the affected PCs:
v13.08.25 Log and Attended output section
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Method 2 was found at:
Z:\installers2\SAD3\NT6\x86
List INF's that were matched with this system
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
v13.08.25 Log and Attended output section
*
*
Method 2 was found at:
Z:\installers2\SAD3\NT6\x86
List INF's that were matched with this system
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
v13.08.25 Log and Attended output section
*
*
Method 2 was found at:
Z:\installers2\SAD3\NT6\x86
List INF's that were matched with this system
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
v13.08.25 Log and Attended output section
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*
Method 2 was found at:
C:\SAD3\NT6\x86
List INF's that were matched with this system
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
v13.08.25 Log and Attended output section
*
*
Method 2 was found at:
C:\SAD3\NT6\x86
List INF's that were matched with this system
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
v13.08.25 Log and Attended output section
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*
Method 2 was found at:
C:\SAD3\NT6\x86
List INF's that were matched with this system
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
v13.08.25 Log and Attended output section
*
*
Method 2 was found at:
C:\SAD3\NT6\x86
List INF's that were matched with this system
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'.
Successfull installation of 'c:\d\x86\win7\l\realtek\2\win7\rt86win7.inf'.
Successfull installation of 'c:\d\x86\win7\c\amd\1\smbus\w7\smbusamd.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\realtek_hda\wdm\hdart.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\win2000\atk2000.inf'.
Successfull installation of 'c:\d\dp_ebcf_wnt6-x86_1604\all\ebcf\acpi\acpi\winvista\asacpi.inf'.
The first three runs, from Z:\, were automatic with the /SR switch and did not have access to my custom pack. Already I notice something odd: Driverpacks reporting it installs a Matrox driver from the Graphics B pack. I'm pretty sure the PC has ATI graphics not Matrox.
The fourth run was with the standard script, again with the /SR switch, with my custom pack. (Which I tweaked the folder structure of a bit). It picks up some drivers out of that pack, but not the ATI graphics.
The fifth (and subsequent) run was with your modification.
The sixth run is where I'm frankly baffled. For this run I had only my custom pack in C:\SAD3\NT6\x86. None of the standard packs. There was no C:\D folder before or after the run. And yet Driverpacks still reports itself installing the drivers from the standard packs. Where is it even getting those files from? The log says "Successfull installation of 'c:\d\x86\all\g_b\matrox\1\mxeff.inf'." when that file should not even have existed.
For the seventh run I ran it with the /CR switch, still with only my custom pack, just for the sake of trying something. Afterwards, C:\D contained only that custom pack.