I wouldn't delete that account. It's created by xp automatically for access in case the user doesn't know to create one, or just in case your account with admin. priviledges fails.
I have recently discovered an unknown administrator named 'administrator' in user accounts in the control panel. I have tried to delete it but there is no option to do so.
I was able to add a password to it, thinking that if somebody is using my computer this might stop them and my only options now are to change the password or change the picture.
Is it possible my computer has been hijacked and if so how can i delete the user?
Thanks for your comments if you can help at all.