Cannot Create New User Account - Domain Problems

I am trying to help a friend create a "restricted" user
for his son to be able to play games with on a WinXP
laptop used primarily for work/vpn. The administrator
account, and the other two accounts that are viewable in
the Control Panel > User Account are all associated with
a domain of one name or another.

The MS knowledgebase states that you cannot create a new
user account since this tool is "not available on a
computer that is a member of a domain." see:
http://snurl.com/1sfv

What steps do we need to take to be able to create a
restricted account for his son?

Again, there is no account that exists without an
associated domain, so we cannot create a new user
account. We also don't want to screw up an existing
account/domain, since this laptop was set up by his
company in India. He is consulting in the USA right now,
so it's not very easy for us to contact the IT guys that
configured this laptop. Please help!

Regards,
Peterson