Okay, here is some good news. I stripped my system of both VS2008 and VS2010. I then ran Norton Utilities to clean the registry of all entries after removal. I then rebooted my PC. I reinstalled VS2008 and VS2010 with SPs. I then installed first, the Dark GDK. I made sure I added the proper include and library references under "Tools" as described.
I followed that by installing Dark GDK.NET. I then opened the Game Level sample program as a C++ project in VS2008. I added the line "dbSetDisplayMode(1680,1050,32)". It compiled without issue and ran as expected.
So, I then loaded the app I have been creating in VB.NET and added the code back in, but, added the bit depth to the command. It ran like a champ! So I am now very happy.
Russell B. Davis/aerostudios