Prevent Users from Viewing Blocked Networks
Applies To: Windows Server 2008, Windows Vista
Follow these steps to prevent wireless client computers running Windows Vista from displaying wireless networks to which you have denied access.
Membership in Domain Admins, or equivalent, is the minimum requirement to complete this procedure.
To prevent users from viewing networks in the Deny list
Open the Windows Vista Wireless Policy.
On the Network Permissions tab, clear the Allow user to view denied networks check box, and then click OK.