Help!

I can find no reference to the errors I'm receiving.
I'm running ZESM 3.5 ir2. Zenworks security client is installed on XP
sp2. In the event log of the workstation I get:

Source: MSSOAP
Category: Generic
Event id: 16
Description: Soap Error: Bad Certificate

After that error I get this one:
Souce: MSSOAP
Category: Generic
Event id: 16
Description: Soap error: XML Parser failed at line number 1, Lineposition
0, reason is: a document must contain exactly one root element.

These errors repeat over and over in the event log.

I assume the second error is due to the first and that I've got a
certificate problem, but I have no idea how to proceed.

paul