Volume Shadow Copy errors with NTbackup

We seem to be getting VSS errors whenever we run NTbackup all of the sudden.

We are running Windows server 2003 as a terminal server and domain controller (I know, not recommended, but necessary).

All of the sudden NT backup stops working.  It fails with the error in the backup report:

Volume shadow copy creation: Attempt 1.
Error returned while creating the volume shadow copy:0x8004230f.
Error returned while creating the volume shadow copy:8004230f

This happens even if I when I do a test backup of a single folder.

Checking the event logs after the backup we have the following errors:
VSS eventID 20:
Volume Shadow Copy Service error: A critical component required by the Volume Shadow Copy service is not registered.  This might happened if an error occurred during Windows setup or during installation of a Shadow Copy provider.  The error returned from CoCreateInstance on class with CLSID {5fc845eb-f299-40f0-9725-34045f7ea8ba} and Name HWPRV is [0x80040154].

VSS eventID 12292:
Volume Shadow Copy Service error: Error creating the Shadow Copy Provider COM class with CLSID {5fc845eb-f299-40f0-9725-34045f7ea8ba} [0x80040154].


Interesting thing is that if I go into the c drive properties and create a shadow copy of c, it appears to work fine, no errors in the event log.

The only info regarding this on the net involved reregistering VSS with the following commands run from the windows\system32 folder:
Net stop vss
Net stop swprv
regsvr32 ole32.dll
regsvr32 vss_ps.dll
Vssvc /Register
regsvr32 /i swprv.dll
regsvr32 /i eventcls.dll
regsvr32 es.dll
regsvr32 stdprov.dll
regsvr32 vssui.dll
regsvr32 msxml.dll
regsvr32 msxml3.dll
regsvr32 msxml4.dll

Tried it and rebooted, but no joy.

Any help much appreciated.

The only solutions I could find on the net involved reregistering
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