Hello.
I just installed Sparky game over on my test pc.
It has a Nvidia 450 GTS.
I couldn't get the Nvidia driver installed using the graphical " Device Driver Manager".
It would report the driver is installed, but it isn't, i tried it several times, rebooting the pc afterwards.
It worked when i opened a shell and called: sudo ddm -i nvidia.
Now it works, but it looks as if there is something wrong with the graphical Device driver manager.
Greets, Ger.
Sorry, I can't help you with ddm.
Try to post it on SolydXK forum, to the ddm developer.