Ran into an interesting issue.. I was trying to convert a Windows XP VM from xen to vmware using vCenter Converter Standalone. Conversion will fail in 10 seconds with Status “Failed: Unable to create a VSS snapshot of the source volume(s) Error Code: 2147754776 (0x80042318)..
Upon examining Application event log – I saw two different VSS errors for every attempt I made
Volume Shadow Copy Service error: An internal inconsistency was detected in trying to contact shadow copy service writers. Please check to see that the Event Service and Volume Shadow Copy Service are operating properly.
Volume Shadow Copy Service error: Shadow Copy writer ContentIndexingService called routine RegQueryValueExW which failed with status 0x80070002 (converted to 0x800423f4).
vssadmin list writers on target I received Error: 0x8000FFFF. Inconsitency have been detected. That’s it nothing else.
Upon researching further I came across following link which spells out solution
End user had uninstalled visio from the machine so to reslove this issue I had to delete visio key located under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ContentIndex\Catalogs
It is also vaguely documented on Microsoft knowledge base