directx CreateDevice is giving a D3DERR_INVALIDCALL help!!

I started programming a directx 3D graphics engine that runs in full screen, a couple months ago for a game I'm trying to make. I started programming and thought I finished the engine and started on the game.  
A month ago I moved to a new apartment, so I burnt and transferred all my files to a new computer. It still compiles just fine but I get a D3DERR_INVALIDCALL when I call the CreateDevice function. At first I thought there was something wrong with my computer so I played with compiling and running some of the directx example files, but they all worked fine.  So I must be doing something wrong in my code. Here is some of my code, keep in mind that the code is in a couple of different functions so the variable names might not line up:

// here is some header info
#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <mmsystem.h>

#include <d3d8.h>
#include <d3dx8.h>
#include <dinput.h>
#include <stdio.h>
// Variables
LPDIRECT3D8 g_pD3D = 0;
LPDIRECT3DSURFACE8 g_pBackSurface = 0;
LPDIRECT3DVERTEXBUFFER8 g_pVB = 0;
LPDIRECT3DDEVICE8 g_pDevice= 0;
LPDIRECT3DINDEXBUFFER8 g_pIB=0;
LPDIRECT3DTEXTURE8 g_pTexture =0;
LPDIRECTINPUT8 g_pDI =0;

// here is where I setup the window I'm going to use.
      HWND hWnd;
      WNDCLASSEX wc;
      static char strAppName[]= GAME_NAME;

      wc.cbSize = sizeof(WNDCLASSEX);
      wc.style = CS_HREDRAW | CS_VREDRAW |CS_OWNDC;
      wc.cbClsExtra = 0;
      wc.cbWndExtra = 0;
      wc.lpfnWndProc = WndProc;
      wc.hInstance = hInstance;
      wc.hbrBackground = (HBRUSH)GetStockObject( DKGRAY_BRUSH );
      wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
      wc.hIconSm = LoadIcon( NULL, IDI_APPLICATION);
      wc.hCursor = LoadCursor( NULL, IDC_CROSS);
      wc.lpszMenuName = NULL;
      wc.lpszClassName = strAppName;
      
      RegisterClassEx( &wc);

      hWnd = CreateWindowEx(WS_EX_TOPMOST, strAppName, strAppName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 300, 150, NULL, NULL, hInstance, NULL);
 
      hWndMain = hWnd;
            ShowWindow ( hWnd, iCmdShow);
            UpdateWindow (hWnd);
             return hWnd;
// this is my call to create the direct3d object
                g_pD3D =Direct3DCreate8( D3D_SDK_VERSION);

// and this is where I call the CreateDevice function
                                LPDIRECT3DDEVICE8 pDevice= 0;
            HRESULT r = 0;
            D3DDISPLAYMODE d3ddm;
            D3DPRESENT_PARAMETERS d3dpp;
            
            r=pD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &d3ddm);
            if ( FAILED(r) )
            {
                  SetError("Couldnot get display adapter information");
                  return NULL;
            }

            ZeroMemory( &d3dpp, sizeof( D3DPRESENT_PARAMETERS ) );

            d3dpp.BackBufferCount = 1;
            d3dpp.BackBufferWidth = 800;
            d3dpp.BackBufferHeight = 600;
            d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;
            d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE;
            d3dpp.SwapEffect = D3DSWAPEFFECT_COPY_VSYNC;
            d3dpp.hDeviceWindow = hWndMain;
            d3dpp.Windowed = FALSE;
            d3dpp.EnableAutoDepthStencil = TRUE;
            d3dpp.AutoDepthStencilFormat =D3DFMT_D16;
            d3dpp.FullScreen_RefreshRateInHz = 0;
            d3dpp.FullScreen_PresentationInterval = D3DPRESENT_INTERVAL_ONE;
            d3dpp.Flags = D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
            
            r = pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWndMain, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &pDevice);

            if ( FAILED(r))
            {
                                            char *MyMessage;
                                            if ( r == D3DERR_INVALIDCALL)
                                            {
                                                     MyMessage =new char[]=  "INVALIDCALL";
                                            } else if ( r==D3DERR_NOTAVAILABLE) {
                                                     MyMessage =new char[]=  "NOTAVAILABLE";
                                            } else if ( r==D3DERR_OUTOFVIDEOMEMORY) {
                                                     MyMessage =new char[]=  "OUTOFVIDEOMEMORY";
                                            }
                                            MessageBox(NULL,MyMessage,"Results", MB_YESNO);
                        SetError("Could not create the render device");
                        return NULL;
            }

That's it. I don't know what I'm doing wrong. I've been working on this for a couple days now. I’ve been striping the code down and trying different screen settings, but all give the same error. Any input would be greatly appreciated.

Thanks,
Minott