WMI does exist on Windows 2003.  It is part of system state.  You can use
the command vssadmin list writers to show you a list of the services that
reside on Windows 2003 which may participate in system state or system
service backup.

The  VSS_E_WRITER_INFRASTRUCTURE is a possible indication that the Windows
2003 Volume Shadow Copy Service is not running or is an error state.

The VSS_WS_FAILED_AT_FREEZE is an indication that the WMI service is in
such a state that it vetoed the request by TSM to create a shadow copy
from which system state backup could be obtained.  I would check the
status of the "Windows Instrumentation Service" in the service control
panel to insure that it was running (and that the service startup was set
to its default-Automatic).  I would also examine the Windows event log to
see if there are any WMI-related messages there.

The vssadmin list writers command can give you an indication of the status
of VSS on your system.

Regards,

Mike Dile
Tivoli Storage Manager Client Development
Tivoli Software, IBM Software Group
mikedile AT us.ibm DOT com