Pappocom Sodoku doesn't launch in Windows 10 (or other variants if you revert to Windows 7 or 8.1)
Reason will not open if DEP (Data Executive Prevention) is switch on for all programs. In earlier version of Windows this was only switch on for windows programs and services. Windows 10 requires it to be switched on for all programs otherwise it will not install correctly.
I had other issues with windows 10 and so reverted back to Windows 7, however, I had forgotten that I had changed this parameter and was dismayed when Sodoku didn't launch, so I tried re-insatlling this with out any luck.
Brainwave - remembered the change and set it back and now all working again.
Hope this helps others