The Workstation service terminated with service-specific error 225

Hi All

I have a Preimum SBS 2003 server at a clients site which is experiencing
intermitent problems with the loss of network drives to the server. on
checking the server i can see the workstation service has stopped and the
following errors are in the event log

first error = Could not load Rdbss device driver. Event ID: 5727
Followed by = Could not load RDR device driver. Event ID: 5727
and then = The Workstation service terminated with service-specific error
2250 (0x8CA).

now i have looked on the microsoft web site and could not really find
anything about the following problem,does anyone have any ideas what could be
causing this problem? The only way we can resolve the problem at the moment
is by restarting the server which is not ideal.

to give you some more info on other application which are installed on the
server are as follows

GoldMine 7
Symantec Antivirus
Symantec Mail Security

thanks