mountain lion 10.8.2 can not connect to windows NAS server Dell Sentinel

I recently upgraded to 10.8 OS My office is connected to a NAS server Dell Sentinel WD4000. Everything was working fine until the upgrade from 10.7 to 10.8 Now when I "connect to server" Not one of my accounts can connect. All I get is wrong password. The server connects to every computer on the network except the 10.8 The server shows up as an icon on Shared Devices.

Someone please help me. Apple has been useless.