To remedy this situation you can right click on my computer, select manage, and browse to the groups section under the local users and groups heading. Double clicking the users group should display all of its members. You will notice in this group that NT AUTORITY/INTERACTIVE is a member. Selecting this account and clicking remove will remove it from the group and prevent users from creating other local user accounts.
Chris Sanders is the network administrator for one of the largest public school systems in the state of Kentucky. Chris's specialties include general network administration, windows server 2003, wireless networking, and security. You can view Chris' personal website at www.chrissanders.org.