Player shaking when colliding with objects

Hi! I've recently encountered a problem with my player GameObject's script. As the question says, my object is shaking everytime it moves towards any object. Is there some way I can stop it from doing so? Here is my script:

var MoveSpeed : float = 2.5f;

var RunSpeed : float = 5f;

var Forward : float = 3.5f;

var JumpHeight : float = 10000f;

var Jumped = false;

 function Start ()
 {
     rigidbody.freezeRotation = true;
 }
 function Update ()
 {
     if(Input.GetKey(KeyCode.Space) && !Jumped)
     {
         Jumped = true;
         rigidbody.AddForce(Vector3.up * JumpHeight *  Time.deltaTime);
     }
     //Player movement
     if(Input.GetKey(KeyCode.W))
         transform.Translate(Vector3.forward * Forward * Time.deltaTime);
     if(Input.GetKey(KeyCode.S))
         transform.Translate(Vector3.back * MoveSpeed * Time.deltaTime);
     if(Input.GetKey(KeyCode.D))
         transform.Translate(Vector3.right * MoveSpeed * Time.deltaTime);
     if(Input.GetKey(KeyCode.A))
         transform.Translate(Vector3.left * MoveSpeed * Time.deltaTime);
     //Player run movement
     if(Input.GetKey(KeyCode.LeftShift))
     {
         if(Input.GetKey(KeyCode.W))
             transform.Translate(Vector3.forward * Forward * Time.deltaTime);
         if(Input.GetKey(KeyCode.S))
             transform.Translate(Vector3.back * MoveSpeed * Time.deltaTime);
         if(Input.GetKey(KeyCode.D))
             transform.Translate(Vector3.right * MoveSpeed * Time.deltaTime);
         if(Input.GetKey(KeyCode.A))
             transform.Translate(Vector3.left * MoveSpeed * Time.deltaTime);
     }
 }
 function OnTriggerStay ()
 {
     Jumped = false;
 }

That's all! I don't know if its because I'm using Translate. Sorry, I've only started Unity about a week ago.