administrator problem vista

Hi, I read that it's better to not workd/play on an administrator account on vista. I always did but now i'd like to change this. I made a different account, set this one to administrator and made mine a normal account.
Then i tried to hide the administrator using
net user administrator /active:no

I used it on my account and the administrator account and both say: acces denied, how do i solve this?
thnx for any replies

Did u run Command Prompt in Administrator?

yes, i tried both, the normal one and the that with administrator
error 5
acces denied is the responce

Try this it should work

i tried the sysprep /generalize but the prompt sais it's doesn't recognize it

Hmmmmmm, ill give my friend a call quick

thnx for helping, maybe it has something to do with the language isn't set in english, it in dutch.
I keep reading on websites that there allready is an administrator account hidden, but i haven't seen any of this. I just made my user account administrater and now i'm just making a new account to hide.

omg, I feel so stupid. I just had to type net user admin isntead, because i named the account admin.
Thnx for your help Foxx.

Mods u can close this now.

Hey have you tried typing that "net user" stuff all in dutch?