You have to include the lib and include files for DarkGdk in the visual c++ IDE.
1) Open visual studio.
2) Click Tools...Options.
3) Click the [+] next to the Projects and Solutions option.
4) Click on VC++ Directories.
5) In the combobox in the right-hand corner, select 'include' from the drop-down menu.
6) Click the 'new folder' icon to make a new entry.
7) Click the [...] button on the right side of the new entry.
8) Navigate to ...\The Game Creators\Dark GDK\Include
9) Select 'OK' to set that new entry to the include folder.
10) Select 'lib' from the drop-down menu of the combobox.
11) Repeat steps 6-9, but for step 8, navigate to ...\The Game Creators\Dark GDK\Lib\vs9
12) Click 'OK' until all windows are closed.
13) Now try to compile a DarkGDK project.
#ifdef _DEBUG
FixBugs(All);
#endif