I am having the same problem. It started happening after applying some recent Windows updates and installing WSUS services on the server. My server is Server 2003 Enterprise. None of the Volume Shadow components are backing up on that server, but they are on my other server. I show no errors when I run the VSSADMIN command. I also referenced the Microsoft Q article 826936 as referenced in Veritas Doc 261993 and find none of the errors listed there in my server event logs. Can someone help us?