Tyr to run the microsoft WMI diagnostic tools on one of the workstations and post the result. Most likely the default permissions for WMI have been changed.
I ran the config tester and it comes back access denied. Doing this on about 20 computers. 180 scan fine. Domain admin acct scanning. The machine in question is online, pingable, firewall rules are correct... I need assistance to get this ironed out.