unable to launch internet explorer in TestNG - selenium-webdriver

Question

I am new in TestNG. This is my code which I tried in eclipse, but there is a problem occurring in launching internet explorer.
The error it is giving is
org.openqa.selenium.remote.SessionNotFoundException: Unexpected error launching Internet Explorer. Protected Mode settings are not the same for all zones. Enable Protected Mode must be set to the same value (enabled or disabled) for all zones. (WARNING: The server did not provide any stacktrace information)
This is the complete code....
package com.tcs.medmantra;
import java.io.File;
import java.io.IOException;
import java.util.Set;
import org.openqa.selenium.Alert;
import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.Keys;
import org.openqa.selenium.NoAlertPresentException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.ie.InternetExplorerDriver;
import org.openqa.selenium.interactions.Actions;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.Select;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.openqa.selenium.ie.InternetExplorerDriver;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.AfterTest;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
public class Registration {
WebDriver driver;
WebElement element;
WebElement element2;
WebDriverWait waiter;
#Test(priority = 1)
public void register_With_Cash() throws RowsExceededException, BiffException, WriteException, IOException
{
driver=new InternetExplorerDriver();
driver.get("https://172.25.155.250/loginpage.aspx");
//((JavascriptExecutor)driver).executeScript("window.resizeTo(1366, 768);");
waiter = new WebDriverWait (driver, 40);
driver.findElement(By.id("txtuname")).sendKeys("122337");
driver.findElement(By.name("txtpwd")).sendKeys("Tcs!#345");
driver.findElement(By.id("btnsubmit")).click();
sleep(25000);
//print URL
String url = driver.getCurrentUrl();
System.out.println(url);
}
#BeforeTest
public void beforeTest() {
File file = new File("D:\\IEDriverServer.exe");
System.setProperty("webdriver.ie.driver", file.getAbsolutePath());
}
#AfterTest
public void afterTest() {
driver.quit();
}
}

Answer 1

As the error says you need set the protected mode same for all zones, either enabled or disabled. Preferred would be enabled. See here

Answer 2

Change your code to include the path for InternetExplorerDriver.
File file = new File("C:/Selenium/iexploredriver.exe");
System.setProperty("webdriver.ie.driver", file.getAbsolutePath());
WebDriver driver = new InternetExplorerDriver();