Process p2 = Runtime.getRuntime().exec("TASKLIST /V /FI \"IMAGENAME eq iexplore.exe\"");
BufferedReader input = new BufferedReader(new InputStreamReader(p2.getInputStream()));
String line, pid = "";
while ((line = input.readLine()) != null) {
   if(line.contains(tag)){
      String[] taskTokens = line.replaceAll("\\s+", " ").trim().split(" ");
      pid = taskTokens[1];
      System.out.println("PID:"+pid);
   }
}
input.close();

Runtime.getRuntime().exec("TASKKILL /PID " + pid);

Runtime.getRuntime().exec("taskkill -f -fi \"imagename iexplorer.exe\"");