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procedure ExecuteNewInstance(AExplicitAdmin, AWait: Boolean; AWindow: THandle;
  AParams: string);
type
  TIsUserAnAdminFunc = function (): BOOL; stdcall;
var
  Shell32DLL: THandle;
  IsUserAnAdminFunc: TIsUserAnAdminFunc;
  AlreadyAdmin: Boolean;
  ExecuteInfo: SHELLEXECUTEINFO;
begin
  ExecuteInfo.cbSize := sizeof(SHELLEXECUTEINFO);
  ExecuteInfo.Wnd := AWindow;
  ExecuteInfo.fMask := SEE_MASK_NOCLOSEPROCESS;
  AlreadyAdmin := False;
  Shell32DLL := LoadLibrary('shell32.dll');
  try
    if Shell32DLL <> 0 then
    begin
      @IsUserAnAdminFunc := GetProcAddress(Shell32DLL, 'IsUserAnAdmin');
      if Assigned(@IsUserAnAdminFunc) then
        AlreadyAdmin := IsUserAnAdminFunc();
    end;
  finally
    FreeLibrary(Shell32DLL);
  end;
  if AExplicitAdmin and not AlreadyAdmin then
    ExecuteInfo.lpVerb := 'runas'
  else
    ExecuteInfo.lpVerb := 'open';

  ExecuteInfo.lpFile := PChar(ParamStr(0));
  ExecuteInfo.lpParameters := PChar(AParams);
  ExecuteInfo.lpDirectory := PChar(ExtractFilePath(ParamStr(0)));
  ExecuteInfo.nShow := SW_SHOWNORMAL;

  if ShellExecuteEx(@ExecuteInfo) then
    try
      if AWait then
        WaitForSingleObject(ExecuteInfo.hProcess, INFINITE);
    finally
      CloseHandle(ExecuteInfo.hProcess);
    end;
end;