HCK Certified driver... Windows 7 x 64 -- Code 52

We recently certified our driver running 4 HCK test suites:

Windows 8 x32
Windows 8 x64
Windows 7 x32
Windows 7 x64

Create Package, Sign Package, Submit to sysdev, qualify package.

Here is the strange part:

Windows 8 x32 - Installs & Works
Windows 8 x64 - Installs & Works
Windows 7 x32 - Installs & Works
Windows 7 x64 - Installs & Code 52


In the OSAttr for the CAT file we see the following OSes: 2:5.00,2:5.1,2:6.0


Assuming the error was on our side, we resubmitted a merged package of 8 x32, 8x64

(Again fails only on Windows 7 x64)

OSAttr for the CAT File: 2:5.1,2:6.0,2:6.3

Trying the procedure AGAIN we made a merge package of all 4, and get back even DIFFERENT OSAttr: 2:5.1,2:6.0,2:6.1,2:6.3


Any suggestions? Ideas?

What recommendations are there for a HCK/WHQL test system setup would be recommended? 4 identical hardware boxes, and 1 controller?

Thanks in advance,
Roscoe Casita.