Change User Name

Just to let you know...I have gone to control panel to
change the username, however the username THERE is
right!! How do I change it...thanks!
>-----Original Message-----
>Can anyone tell me how you can change the default
username
>from A to whatever I require??
>
>If I click on start and log off...it has my name there,
>however when I press ctrl+alt+del the user name there
>comes up as a...how can I change that to my name??
>
>Any suggestions??
>
>Thanks
>Shaz
>.
>