The VSS system writer is missing.
To restore VSS on Windows Server 2008, refer to Microsoft's article System Writer is missing, and backups fail in Windows Server 2008.
For other Windows Server operating systems, delete the following folders:
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\
- C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\
To see more information on this issue for Windows Server 2008, see Event ID 513 — Shadow Copy System Writer Functionality.