S: (Subjective)
===============
常見因為非微軟的備份軟體導致VSS有問題造成Backup出現狀況

A: (Assessment)
==============

以下為重新註冊檔案做法
6/29/2009    下午 02:34:52    1    0    12293    VSS    N/A    ComputerName    {b5946137-7b9f-4925-af80-51abd60b20d5} IVssSnapshotProvider::QueryVolumesSupportedForSnapshots(ProviderId,29,...) 0x8000ffff

請於以下登錄編輯程式,右鍵使用權限,加入管理者權限,給予Full control權限,請備份後刪除Volume 下的登錄機碼
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\STORAGE\Volume

完成後重新啟動電腦確認登錄值是否有再重建,若是沒有請根據下列步驟重新註冊

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.
o    cd /d %windir%\system32
o    Net stop vss
o    Net stop swprv
o    regsvr32 ole32.dll
o    regsvr32 oleaut32.dll
o    regsvr32 vss_ps.dll
o    vssvc /register
o    regsvr32 /i swprv.dll
o    regsvr32 /i eventcls.dll
o    regsvr32 es.dll
o    regsvr32 stdprov.dll
o    regsvr32 vssui.dll
o    regsvr32 msxml.dll
o    regsvr32 msxml3.dll
o    regsvr32 msxml4.dll

其他參考
Various issues may occur on a Windows Server 2003-based computer that is running the Volume Shadow Copy Service
<http://support.microsoft.com/default.aspx?scid=kb;EN-US;940032>