Wir hatten diesen Fehler im event log und hatten einige tage damit verbracht die ursache zu finden:
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 [0x80004002, No such interface supported
das problem: acronis !!!!! siehe anleitung zum entfernen der referenz aus der registry:
How to Fix Volume Shadow Copy Service error: Error creating the Shadow Copy Provider COM class with CLSID 5fc845eb-f299-40f0-9725-34045f7ea8ba