The only real "driver" would seem to be the one used by the RC stuff. Try
not installing this portion of the agent that seems to help.

While not "Drivers" per se, there are also 4 additional services running on
the PC.
One is called "Workstation Manager" and the other three all start with the
name "ZENworks".
Try disabling all three to see if disabling them resolves the issue.

Issuing a 'NET START' will list all running services.
A 'NET STOP' will stop a service.

Is the Novell Client installed on these PCs or are you using "Middle-Tier"
communication?
What exactly do you mean by "Contacts" the ZFD Server? What type of things
are you doing at this point in time?