I have made it-
MainWindow.xaml
<Window x:Class="SerializeDeSerialize.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Nikita="clr-namespace:SerializeDeSerialize"
        Title="MainWindow" Height="350" Width="525" Closed="Window_Closed_1" Loaded="Window_Loaded_1">
    <Window.DataContext>
        <Nikita:Movie></Nikita:Movie>
    </Window.DataContext>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>

        </Grid.ColumnDefinitions>

        <Label Name="lblTitle" Content="Title:" Grid.Row="0" Grid.Column="0" Margin="10,25,63,10" HorizontalAlignment="Left" Width="164"></Label>
        <TextBox Grid.Row="0" Name="txtTitle" Grid.Column="1" Margin="10,25,63,10" Text="{Binding Title}"></TextBox>
        <Label Grid.Row="1" Name="lblRating" Content="Rating:" Grid.Column="0" Margin="10,25,63,10" HorizontalAlignment="Left" Width="164"></Label>
        <TextBox Grid.Row="1" Name="txtRating" Grid.Column="1" Margin="10,25,63,10" Text="{Binding Rating}"></TextBox>
        <Label Grid.Row="2" Name="lblReleaseDate" Content="Release Date:" Grid.Column="0"  Margin="10,25,63,10" HorizontalAlignment="Left" Width="164"></Label>
        <TextBox Grid.Row="2" Name="txtReleaseDate" Grid.Column="1" Margin="10,25,63,10" Text="{Binding ReleaseDate}"></TextBox>

            <Button Grid.Row="3" Content="Window1" Margin="66,36,69,10" Click="Button_Click_1"></Button>
        <Button Grid.Row="4" Content="Window2" Margin="66,36,69,10" Click="Button_Click_2"></Button>

    </Grid>
</Window>

MainWindow.xaml.cs


using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Xml.Serialization;

namespace SerializeDeSerialize
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        SerializeDeSerialize.Movie mv = new Movie();
        static Movie mm = new Movie();

        public MainWindow()
        {
            InitializeComponent();

            DataContext = mv;

        }

        private void Window_Closed_1(object sender, EventArgs e)
        {
            SerializeToXML(mv);
        }

        static public void SerializeToXML(Movie movie)
        {
            XmlSerializer serializer = new XmlSerializer(typeof(Movie));
            TextWriter textWriter = new StreamWriter(@"C:Users398780DesktopNikitamovie.xml");
            serializer.Serialize(textWriter, movie);
            textWriter.Close();
        }

        private void Window_Loaded_1(object sender, RoutedEventArgs e)
        {
            mm=DeserializeFromXML();
            txtTitle.Text = mm.Title;
            txtRating.Text =Convert.ToString(mm.Rating);
            txtReleaseDate.Text = Convert.ToString(mm.ReleaseDate);

        }

        static Movie DeserializeFromXML()
        {
            XmlSerializer deserializer = new XmlSerializer(typeof(Movie));
            TextReader textReader = new StreamReader(@"C:Users398780DesktopNikitamovie.xml");
            mm=(Movie)deserializer.Deserialize(textReader);

            textReader.Close();

            return mm;
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            Window1 win1 = new Window1();
            win1.Show();
        }

        private void Button_Click_2(object sender, RoutedEventArgs e)
        {
            Window2 win2 = new Window2();
            win2.Show();
        }
    }
}

MVVM-movie.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SerializeDeSerialize
{
    public class Movie
    {
        private string _title;
        private int _rating;
        private DateTime _releaseDate;

        public Movie()
        {
        }
        public string Title
        {
            get { return _title; }
            set { _title = value; }
        }

        public int Rating
        {
            get { return _rating; }
            set { _rating = value; }
        }

        public DateTime ReleaseDate
        {
            get { return _releaseDate; }
            set { _releaseDate = value; }
        }
    }
}

Please check..it is same as you told or not?