Using VSS on 64-bit W2K8 from a 32-bit application

[wn123456@gmail.com]

Hi,

We have a 32bit application using the Volume Shadow Copy API on 64-bit
W2K8 (Longhorn beta3 is installed). Our 32-bit application is using
the Windows 2003 VSS API library. There is no problem doing this with
32-bit W2K8, the problem is only with 64-bit.

When InitializeForBackup() is called it is returning 0x8000ffff
(E_UNEXPECTED). The event log contains:

Volume Shadow Copy Service error: The VSS Coordinator class is not
registered. This may be caused due to a setup failure or as a result
of an application's installer or uninstaller.

and

"Volume Shadow Copy Service error: Unexpected error calling routine
CoCreateInstance. hr = 0x80040154.

Is there a fix for this?

Thanks
WN