This code forces me to turn-off my PC.

You ( Tim Roberts ) told John Keenan:
??? Are you saying that you did this in a user-mode application and it
  generated a blue screen? That's not supposed to be possible. ???.

About 2 weeks ago, my code blue-screened my WinXP box,
other times it spontaneously rebooted.

I even crashed the VC++ 8.0 compiler ( yet again ),
the report was sent to MicroSoft.

I was really tired at the time so I didn't try to reproduce it.
This code forces me to turn-off my PC:

#pragma warning( disable: 4100 4127 4189 4430 4508 4706 )
#define _WIN32_WINNT 0x0501
#define UNICODE
#include <Windows.H>

#define Quote_It( It ) #It
#define DD_Path( __X ) Quote_It( \
  C:\\Program Files\\Microsoft DirectX SDK (December 2005)\\__X )
#include DD_Path( Include\\DDraw.H )
#pragma comment( lib , DD_Path( Lib\\x86\\DDraw.LIB ) )
#pragma comment( lib , DD_Path( Lib\\x86\\DXguid.LIB ) )
#include DD_Path( Include\\Dxerr8.H )
#pragma comment( lib , DD_Path( Lib\\x86\\Dxerr8.LIB ) )

#define CW CreateWindow
#define _SurT LPDIRECTDRAWSURFACE7
#define SetPtr SelectObject
#define Loop( N ) int J = - 1 , LLL = N ; while ( ++ J < LLL )

typedef unsigned int uint; typedef wchar_t * LnP ;

LPDIRECTDRAW _Direct_Draw; LPDIRECTDRAW7 Direct_Draw;
DDSURFACEDESC2 Z = { sizeof Z, DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH };
HWND Win ;

long __stdcall WinProc ( HWND Wnd, uint _WM, uint C, long C2 ) {
  return 1 ; }

  #define Okay ( \
    rv >= 0 || rv == DDERR_WASSTILLDRAWING || rv == DDERR_SURFACELOST )
int Chk( int rv ) { if ( Okay ) return rv ;
  LnP Err = LnP( DXGetErrorString8( rv ) );
  return rv ; }

  int W = 32000, H = 20, rv, CacheW, CacheH, X ; HDC DC ; HFONT Fnt ;
BlueScreen() { _SurT Oops ; Z.dwWidth = W , Z.dwHeight = H ;
  Chk( Direct_Draw->CreateSurface( & Z, & Oops, 0 ) );
  
  if ( Oops && ! ( rv = Oops->GetDC( & DC ) ) ) {
    SetPtr( DC, Fnt );
    Loop( W / CacheW + 3 ) TextOut( DC, X += CacheW, 0, L"X", 1 ); }
    
  if ( Oops && ! rv ) BlueScreen(); }

__stdcall WinMain( HINSTANCE PID, HINSTANCE, char*, int ) {

  DirectDrawCreate( 0, & _Direct_Draw, 0 );
  _Direct_Draw->QueryInterface( IID_IDirectDraw7, (VOID**) & Direct_Draw );
  if ( ! _Direct_Draw ) return ;

  WNDCLASS Class = { 0, WinProc , 0,0, PID, 0, 0, 0, 0, L"WinProc" };
  RegisterClass( & Class );
  Win = CW(L"WinProc", 0, 0, 0, 0, 1, 1, 0, 0, PID, 0 );

  Direct_Draw->SetCooperativeLevel( Win, DDSCL_NORMAL );
  Z.ddsCaps.dwCaps = DDSCAPS_TEXTURE ; // DDSCAPS_VIDEOMEMORY
  
  Fnt = CreateFont( CacheH = 64, 0,0,0,0,0,0,0,0,0,0,0,0, L"MS Mincho");
  CacheW = CacheH * 128 / 256 ;
  BlueScreen(); }