change
#include "DarkGdk.h" to
#include <DarkGdk.h>
The error window tells you right away that it can't find the include file.. line 8... which is where from that screen shot I figured is your include....
Make sure visual C++ can find the DarkGDK.h and make sure it has DarkGDK.lib or whatever its called either as part of your C++ "search lib's" or include it implicitly in projects->linker->input->AdditionalDependancies...
there you put whole path + filename in ... in quotes:
"c:\blah blah\blah\DarkGDK.lib"
3megs for a screen shot is a bit much... I agree... take a moment in the furture to save as a png or something... jpeg... And...what's the rush? LOL... You won't finish a game in t-minus-10 seconds.. you could of used this waiting time to google Visual C++ linker errors, how to set up the thing... I know I sound "dad'ish" right now.. but... relax.. you haven't even started yet!
Wish you wonderful success.. and I hope to see screenies - (png of course) of your progress making a game!