Log into windows under your orginal account. Once logged in, go to "User Accounts" and click "Change an Account," then clicck on your original account icon. Once in your original account options remove the password, follow instructions there. Then create a new password for that account. Also, make sure there is no other Administrator accounts. If there are, remove them. Reboot and log into your original account with your password and you should be good to go.
Note: If you have previously selected to make this account private, the option is not available. If you haven't told it to do this, then it might be available. Otherwise, the option won't be listed at all.
Hope that helps...lemme know if it does!