Hello,
just wanted to share my solution to http://seer.entsupport.symantec.com/docs/286004.htm
The error occured on a W2K3 SP1 standard english system (be9.1 and MSXML4 SP2 already installed).
The be11d setup starts the msxml.msi from WINNT\INSTALL\MSXML and fails (with the msiexec installer log saying that it cannot find file WINNT\INSTALL\MSXML\msxml4_sp2.msi).
The reason for msiexec to look for file msxml4_sp2.msi seems to be that this was the name of the file with which SP2 was originally installed (it really was installed like that). Putting a copy of msxml.msi named msxml4_sp2.msi into WINNT\INSTALL\MSXML causes msiexec not to fail. So, this seems like a msiexec issue, not be11d.
Regards
Thomas