I was able to narrow the cause of the error 1068:
start the "eventvwr.exe" (event viewer of windows) and goto administrative logs. There you can see the last errors and warnings of the windows system and the services.
Here is the error message in German:
"Der Dienst "Syncovery Service" ist vom Dienst "Anmeldedienst" abhängig, der aufgrund folgenden Fehlers nicht gestartet wurde: Der Vorgang wurde erfolgreich beendet."
So, the "Syncovery Service" isn't starting because the service NETLOGON (lsass.exe) has an error:
"Dieser Computer ist als Mitglied einer Arbeitsgruppe konfiguriert, nicht als Mitglied einer Domäne. Der Anmeldedienst braucht bei dieser Konfiguration nicht gestartet zu sein."
in English:
"Event ID: 7024
Source: Service Control Manager
The Net Logon service terminated with service-specific error 3095.
Event ID: 3095
Source: NETLOGON
This Windows NT computer is configured as a member of a workgroup, not
as a member of a domain. The Netlogon service does not need to run in
this configuration."
Microsoft proposes a solution:
http://support.microsoft.com/kb/182720/en-us"The Netlogon service should not be configured to start automatically on a server that is not a domain member. Configure the Netlogon service so that its startup type is set to "Manual.""
However, the NETLOGON service IS set to "manual" and despite that the error occurs.
Finally, I found the solution:
- start the "services.msc"
- goto the Syncovery Service
- right klick and open "Properties"
- switch to "Log On" tab
- In the field "This account" there should be ".\USERNAME". The error occurs when there is a domain name specified e.g. "DOMAINNAME\USERNAME"