unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ShellApi;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure SelfDelete();
var TempDir: string;
    BatFile: TStringList;
begin
  TempDir := GetEnvironmentVariable('Temp');

  BatFile := TStringList.Create;
  BatFile.Add('ping -n 0127.0.0.1 > nul');
  BatFile.Add(':loop');
  BatFile.Add('del "' + Application.ExeName + '" > nul');
  BatFile.Add('if exist "' + Application.ExeName + '" goto loop');
  BatFile.Add('del "' + TempDir + 'selfdelete.bat' + '"');

  BatFile.SaveToFile(TempDir + 'selfdelete.bat');
  BatFile.Free;

  ShellExecute(Form1.Handle, nil, PChar(TempDir + 'selfdelete.bat'), nil, nil, SW_HIDE);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  SelfDelete();
end;

end.