I believe that I got it working. Even though version 3.3 of HDDScan is supposed to support Windows 7, it needed a little help. By running the Program Compatibility troubleshooter in Control Panel I found a solution. I clicked "Run programs made for previous versions of Windows" and HDDScan opened up.
Not so fast...
I just tried running it on my Intel RST RAID 5 array (since I just added another disk) and, while it used to work just fine, it now crashes with a "Floating Point Division by 0 Error" during startup.
Playing with the compatibility settings did not help.
The RAID went from 6TB to 8TB so I'm thinking some limit to disk size was hit.