Microsoft Volume Shadow Copy Service (VSS) snapshot provider selected returned: “Unexpected provider error”.

If you are seeing this error in Backup Exec

” – AOFO: Initialization failure on: “D:”. Advanced Open File Option used: Microsoft Volume Shadow Copy Service (VSS). V-79-10000-11226

– VSS Snapshot error. The Microsoft Volume Shadow Copy Service (VSS) snapshot provider selected returned: “Unexpected provider error”.

Ensure that all provider services are enabled and can be started. Check the Windows Event Viewer for details.”

Try the below solutions that resolved my backup issues:


Make sure that VSS hardware providers are operating properly

To make sure that VSS hardware providers are operating properly:

  1. Open an elevated Command Prompt. Click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
  2. Type vssadmin list providers, and then press Enter.
  3. If a provider is missing from the list of registered providers, try reinstalling it.
  4. For each provider that appears in the list, use the vssadmin create shadow command to create a shadow copy of the volume for which the provider is responsible. For more information, see
  5. If a provider is unable to create a shadow copy, contact Microsoft Customer Service and Support. For more information, see You should provide the entire event log message as it appears in the Event Viewer.


To perform this procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority.

To verify that the Volume Shadow Copy Service is started:

  1. Click Start, point to Administrative Tools, and then click Services.
  2. In the results pane, double-click Volume Shadow Copy.
  3. In Service status, make sure that the status is Started. If the status is not Started, click Start.
  4. Make sure Startup type is set to Manual.
  5. Click OK.



You must have Windows server backup installed first. Then run the following  command to start a System State Backup:

Wbadmin start systemstatebackup -backuptarget:F:
How to repair VSS in Server 2008 r2
How to repair VSS in Server 2003

To resolve this issue, follow these steps:

  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.