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Problem with Fraps-like programs

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Hi. I'm have a little problem with apps like Fraps, or NVPerfHUD, which need to have access to my DirectX device. When i run my program, in CreateWindowEx throws an access violation (only if Fraps-like program is still launched). What i'm doing wrong ? I'm registering class with :
  wc.cbSize = sizeof (WNDCLASSEX);
  wc.style = CS_CLASSDC;
  wc.lpfnWndProc = WindowProc;
  wc.cbClsExtra = 0;
  wc.cbWndExtra = 0;
  wc.hInstance = hInstance;
  wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
  wc.hCursor = (HCURSOR)LoadCursor (NULL, IDC_ARROW);
  wc.hbrBackground = (HBRUSH)GetStockObject (BLACK_BRUSH);
  wc.lpszMenuName = NULL;
  wc.lpszClassName = CLASSNAME;
  wc.hIconSm = NULL;

  if (!RegisterClassEx (&wc))
    return false;
  return true;
and create window with :
  wnd = CreateWindowEx (NULL, CLASSNAME, TEXT ("Full Of Fire Game"), 
      0, 0, width, height, GetDesktopWindow (), NULL, hInstance, NULL);

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