Password Retrival Help Please

Well, I recently created a new account on my Windows XP Home, but I deleted the password to transfer My Documents from my old account. However, when I reenabled the password, I mistyped it, and now I cannot reenter the account. However, before reenabling the password, I set the old account as Limited Account, while the new one is an Administartor. So, I am asking ways that I can retreive my lost password. (And, the computer IS mine, but I did not install windows, so I do not know the Owner password.)