If that doesnt work, go to your DarkGDK folder and find DarkGDK.h and DarkGDK.lib and copy them to this default location
C:\Program Files\Visual Studio 9\VC\lib (DarkGDK.lib)
C:\Program Files\Visual Studio 9\VC\includes (DarkGDK.h)
That should fix the problem. If not.
Open a new solution (Dark GDK- Game)
Then, right click on the project (where it says the name of the solution you created ie. "Dark GDK - Game 1"
Go to properties.
Go to the tree lsit where it says LInkers
Go to input
go to additional dependencies on the right.
Open it up and type
DarkGDK.lib
That should fix your problem
I had the same problem before with Sparkys Collision
typos...