Erro Conexao Sql Server

import java.sql.Connection;
import java.sql.DriverManager;
import javax.swing.JOptionPane;


public class Conect {

	private Connection con;
    private  String NomeServer = "MICRO205";
    private  String NumPorta = "";
    private  String dataBasename = "ConexaoJava";
    private  String Usuario = "sa";
    private  String Senha = "proway";
    private  String url = "jdbc:microsoft:sqlserver://";
    
    
	private String urlGeral(){
		return url+NomeServer+":"+Usuario+":"+Senha;	
	}
	
	public boolean Conecta(){
		

		try{
			Class.forName("com.microsoft.sqlserver.jdbc.DriverJDBCVersion").newInstance();
			this.con = DriverManager.getConnection(urlGeral(),Usuario,Senha);
			JOptionPane.showMessageDialog(null, "Conectado");			
			return true;
	
		}catch(Exception e){
			System.out.println("Erro ao Conectar");
			JOptionPane.showMessageDialog(null, "Error: "+e);
			return false;
		}
		
	}
		public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
		Conect con = new Conect();
		con.Conecta();
		}	
}