[USER=30066]@HapaxOromenon[/USER] - if you open command prompt (in administrator mode), and run the following command:
vssadmin list volumes
What's the output?
Some programs (AV removal tools such as Kasperky, and a few others) have been known to delete relevant VSS registry keys causing this error. The expected output if this is the case is that vssadmin list volumes will return no results. This error may also be appearing in event viewer:
(IVssSnapshotProvider::IsVolumeSupported() failed with 0x8000ffff [hr = 0x8000ffff f, Catastrophic failure]).
