The small business which I work for uses Microsoft Windows Small Business Server 2008. Using SBS Console I can navigate to the Users and Groups tab and then to the individual user. When I click on a user's properties and then click on the Computers tab I can see access levels for each workstation on the domain. For each computer there is a drop down for the Access Level. The drop down, however only allows me to select "Standard User" or "Local Administrator." Is there a way to select something similar to "No Access" for specific workstations for the users?

That would need to be set under group policy, on the DC...I think the editor is called GPMC in server 2008.