Video card not being utilized?

[Overslept]

When I execute the launcher, my GPU is listed but when I click detect, I get this error.

Spoiler below!

If I don't detect and just launch the game with my own settings (I max everything out, GTX 580 handles all of my games maxed), it's very laggy which leads me to believe that instead it is just using my integrated Intel HD 3000 graphics (I have an i7-2600k and an ASUS P8P67 Deluxe).

However, when I play Justine, I get perfect gameplay at 60+ FPS which means that the game's using my dedicated GPU.

Thanks in advance to anyone who can help me.