Hello Kevin,
due to your questions I did find somethindg indeed. It seems Win7 64bits doesnt recognise the WDTx64.sys as a signed driver! I tried to boot the system with the option to allow for unsigned drivers to be installed, and everything worked fine !
I checked the WDTx64.sys file, and found the file seems to be digitally signed by: "Channel Innovations and Solutions Division". When I try to install it by importing the certificate, it says OK, but after that it still doesn't work!? Do you have any suggestions to solve this? (it will be an unattended system, so I can't push the F8 while booting the system each time).
Best Regards
Tonk