Volume Shadow Copy Service error: Unexpected error calling routine ConvertStringSidToSid
- Open your registry editor in Administrative mode
- Navigate to this registry key
- HKey_Local_Machine\Software\Microsoft\Windows NT\CurrentVersion\ProfileList
- Expand and local to the subtree and look for a registry key that ends in .bak.
- Back up this registry key, then delete the key.
- Restart the server.
There is an invalid entry inside the registry for the ProfileList.
See these Microsoft links for more details