Win XP Passwd forgot

From: Yamal Withanage (yamalnw_at_hotmail.com)
Date: 09/05/03 

Date: Fri, 5 Sep 2003 03:23:30 -0700

Hi
I changed windows passowrd recently (my home computer
running win XP Prof)now I forgot it. I'm the one who use
the computer having admin rights.
Now I want to login to my computer because it has many
more important files for me. Therefore I cannot format
the computer.
How can i go about retrieving my old password or just
logging in to change my existing one?
Pl advise me.
Many thanks.'
Yamal