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Event ID: 20 Source: VSS

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 {<GUID>} and Name MSSQL_ClientVirtualDeviceSet is [0x80040154].
Volume Shadow Copy Service error: The Volume Shadow Copy infrastructure cannot be used during Safe Mode. I had this error logged on a Windows 2008 server, turned out VSS service was not running.
This issue occurs because the VSS system files are not registered. See ME940032 for information on how to resolve this problem.
Re-registering the Shadow Copy dlls may help - see the link to Volume Shadow Copy Service and DLLs
See ME904418 for a hotfix applicable to Microsoft SQL Server 2000, when used with Microsoft Windows Server 2003 x64 Edition.

As per Microsoft: "This problem occurs when the backup program tries to use a Sqlvdi.dll file that has been unregistered. Typically, the Sqlvdi.dll file can become unregistered when you uninstall SQL Server Desktop Engine (also known as MSDE 2000) from a computer that is also running Microsoft SQL Server 2000". See ME830575 to fix this problem.
A client started getting this message when backing up the Shadow Copy Components after MSXML4.0 was installed (MSXML3.0 was installed previously). I corrected this by registering "msxml3.dll" with the command: "regsvr32 msxml3.dll" (no quotes).

I fixed this problem by re-installing MSXML 3.0. I also installed MSXML 4.0 for good measure.

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