Como conectar com SQL server 2000

import java.sql.*;
public class DisplayAuthors {

	static final String JDBC_DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
	static final String DATABASE_URL ="jdbc:sqlserver://PIU-LAB/Acervo";
	
	public static void main(String args[]){
		Connection connection = null;
		Statement statement = null;
		
		try{
			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
			connection =
			DriverManager.getConnection("jdbc:sqlserver://PIU-LAB:1433/Acervo","","");
				
			statement = connection.createStatement();
				
			ResultSet resultSet = statement.executeQuery("select * from TblTitulo");
				
			ResultSetMetaData metaData = resultSet.getMetaData();
				
			int numberOfColumns = metaData.getColumnCount();
			System.out.println("Deu certo");
			for(int i =1; i<=numberOfColumns;i++ )
				System.out.printf("%-8s\t",metaData.getColumnName(i));
				System.out.println("Falou");
					
			while(resultSet.next()){
						
				for(int i =1;i<=numberOfColumns;i++)
					System.out.printf("%-8s\t",resultSet.getObject(i));
					System.out.println("Falou");
			}
		}
					
		catch(SQLException sqlException){
			sqlException.printStackTrace();
			System.exit(1);
						
		}
		catch(ClassNotFoundException classNotFound){
			classNotFound.printStackTrace();
			System.exit(1);
						
		}
		finally{
				try{	
		
	
					statement.close();
					connection.close();
	
				}
   				catch(Exception exception){
						exception.printStackTrace();
						System.exit(1);
				}
		}
    }
}

java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:169)
    at DisplayAuthors.main(DisplayAuthors.java:20)

Process completed.