Well first, Edit your code and use the 1010101 button after highlighting your code.

Is the "using http://System.IO;" line really there? If so it should be:

 using System.IO;

If you are getting an error on a particular line, you should really post that. If so it will help(after you format your code) to locate the real error.

Anyways, here is your code, which was missing curly braces and the update method was all dorked up...

 using UnityEngine;
 using System.Collections;
 using System.Xml;
 using System.Xml.Serialization;
 using System.IO;
 using System.Text;
 
 public class Load: MonoBehaviour {
 // This is our local private members
 Rect _Save, _Load, _SaveMSG, _LoadMSG;
 bool _ShouldSave, _ShouldLoad,_SwitchSave,_SwitchLoad;
 string _FileLocation,_FileName;
 public GameObject _Player;
 UserData myData;
 string _PlayerName;
 string _data;
 Vector3 VPosition;
 
 void Start () { // We setup our rectangles for our messages
 
   _Load=new Rect(10,100,100,20); 
 
   _LoadMSG=new Rect(10,140,400,40); 
 
   // Where we want to save and load to and from 
   _FileLocation=Application.dataPath; 
   _FileName="SaveData.xml"; 
 
   // for now, lets just set the name to Joe Schmoe 
   _PlayerName = "Player1"; 
 
   // we need soemthing to store the information into 
   myData=new UserData(); 
 
 }
 
 void Update () {}
 
 void OnGUI() {
     //*************************************************** // Loading The Player... // **************************************************
     if (GUI.Button(_Load,"Load"))
     { 
       GUI.Label(_LoadMSG,"Loading from: "+_FileLocation); 
       // Load our UserData into myData 
       LoadXML(); 
 
           if(_data.ToString() != "") 
           { 
             // notice how I use a reference to type (UserData) here, you need this 
             // so that the returned object is converted into the correct type 
             myData = (UserData)DeserializeObject(_data); 
             // set the players position to the data we loaded 
             VPosition=new Vector3(myData._iUser.x,myData._iUser.y,myData._iUser.z);              
             _Player.transform.position=VPosition; 
             // just a way to show that we loaded in ok 
             Debug.Log(myData._iUser.name); 
           } 
 }

}