Source, and Fix, for Event 8194 VSS "access denied" querying for the IVssWriterCallback

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  Friends I encountered this error, pasted intact below, just a couple of days ago on a ia64 architecture HP system running Windows 7 Ultimate x64

  It appears that I may have a permissions issue somewhere but I do not know how to permanently root-cause-remedy it.  I should note that I do not have any routine backup service running on this particular mule, and no such animal was working at the time of the issue, so I'm baffled as to what invoked the process.  To anticipate a question you may have:  I did not use on this system a recent "registry cleanup" tool except that which Microsoft uses in a couple of automated packages:  one to do .NET cleanup, and another to resolve Uninstall/Install issues [this one succeeded... the .NET issue is another story].

  This system is a Homegroup owner/creator, but is not on a domain. It is essentially a lab mule that I use for tech work - other windows 7 clients fetch files from it via a bridged wifi AP. 

  Thank you in advance for any direction you have for me.

  Paste below

  twest

  
  Log Name:      Application
  Source:        VSS
  Date:          8/18/2012 6:36:49 PM
  Event ID:      8194
  Task Category: None
  Level:         Error
  Keywords:      Classic
  User:          N/A
  Computer:      BossHoss-PC
  Description:
  Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface.  hr = 0x80070005, Access is denied.
  . This is often caused by incorrect security settings in either the writer or requestor process.
  
  Operation:
     Gathering Writer Data
  
  Context:
     Writer Class Id: {e8132975-6f93-4464-a53e-

  1050253ae220}
     Writer Name: System Writer
     Writer Instance ID: {a2af3afe-afb1-4346-bfd6-380873f59328}
  Event Xml:
  <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    <System>
      <Provider Name="VSS" />
      <EventID Qualifiers="0">8194</EventID>
      <Level>2</Level>
      <Task>0</Task>
      <Keywords>0x80000000000000</Keywords>
      <TimeCreated SystemTime="2012-08-18T23:36:49.000000000Z" />
      <EventRecordID>34091</EventRecordID>
      <Channel>Application</Channel>
      <Computer>BossHoss-PC</Computer>
      <Security />
    </System>
    <EventData>
      <Data>0x80070005, Access is denied.
  </Data>
      <Data>
  
  Operation:
     Gathering Writer Data
  
  Context:
     Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220}
     Writer Name: System Writer
     Writer Instance ID: {a2af3afe-afb1-4346-bfd6-380873f59328}</Data>
      <Binary>2D20436F64653A20575254575254494330303030313236302D2043616C6C3A20575254575254494330303030313231342D205049443A202030303030313235322D205449443A202030303030313236382D20434D443A2020433A5C57696E646F77735C73797374656D33325C737663686F73742E657865202D6B204E6574776F726B53657276696365202020202020202D20557365723A204E616D653A204E5420415554484F524954595C4E4554574F524B20534552564943452C205349443A532D312D352D3230</Binary>
    </EventData>
  </Event>

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  Tuesday, August 21, 2012 9:15 PM