Various issues may occur on a Windows Server 2003-based computer that is running the Volume Shadow Copy Service

• When you perform a backup operation by using the NTBackup tool, the following event is logged in the Application log:
  

  Event Type: Error
  Event Source: NTBackup
  Event ID: 8019
  Description: End Operation: Warnings or errors were encountered. Consult the backup report for more details.

  
  
  Note If you view the backup log file, the following information is displayed:
  
  Error returned while creating the volume shadow copy:0xffffffff
• If you access the properties of a volume and then click Shadow Copies, you receive one of the following error messages:
  Error 0x8004230F: The shadow copy provider had an unexpected error while trying to process the specified operation.
  Error 0x80004002: No such interface supported
• One of the following events is logged in the Application log:

  Event Type: Error
  Event Source: VSS
  Event ID: 20
  Description: 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 {faf53cc4-bd73-4e36-83f1-2b23f46e513e} and Name VSSEvent is [0x80040154].

  Event Type: Error
  Event Source: VSS
  Event ID: 20
  Description: 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 {faf53cc4-bd73-4e36-83f1-2b23f46e513e} and Name VSSEvent is [0x80004002].

  Event Type: Error
  Event Source: VSS
  Event ID: 8193
  Description: Volume Shadow Copy Service error: Unexpected error calling routine CoCreateInstance. hr = 0x80040154.

  Event Type: Error
  Event Source: VSS
  Event Category: None
  Event ID: 8193
  Description: Volume Shadow Copy Service error: Unexpected error calling routine CoCreateInstance. hr = 0x80004002.

  Event Type: Error
  Event Source: VSS
  Event ID: 12302
  Description: 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.

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1. Click Start, click Run, type cmd, and then click OK.
2. Type the following commands at a command prompt. Press ENTER after you type each command.
   • cd /d %windir%\system32
   • Net stop vss
   • Net stop swprv
   • regsvr32 ole32.dll
   • regsvr32 oleaut32.dll
   • regsvr32 vss_ps.dll
   • vssvc /register
   • regsvr32 /i swprv.dll
   • regsvr32 /i eventcls.dll
   • regsvr32 es.dll
   • regsvr32 stdprov.dll
   • regsvr32 vssui.dll
   • regsvr32 msxml.dll
   • regsvr32 msxml3.dll
   • regsvr32 msxml4.dll
   Note The last command may not run successfully.
3. Perform a backup operation to verify that the issue is resolved.

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Steps to reproduce this issue

1. Type the following command at a command prompt. Press ENTER after you type the command.
   
   regsvr32 /u swprv.dll
2. Try to perform a backup operation.

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