Instructed to create a new thread for this error.
I am running Windows 7 x64 ultimate.
As per the instructions Windows Update Posting Instructions
here are my results
2) sfc /scannow
No problems, nothing in log (no CSI entries)
3) Error code is 8000FFFF, additionally two errors are logged in event viewer when trying to run the update file manually (Windows6.1-KB2758857-x64.msu)
-a- Error: Windows update client
Installation Failure: Windows failed to install the following update with error 0x8000ffff: Security Update for Windows (KB2758857).
-b- Error: WUSA
Windows update "Security Update for Windows (KB2758857)" could not be installed because of error 2147549183 "Catastrophic failure" (Command line: ""C:\Windows\system32\wusa.exe" "D:\Users\xxxxxxx\Downloads\Windows6.1-KB2758857-x64.msu" ")
4) CBS.rar attached
5) Other things tried
Apart from running various microsoft fixit utilities suggested elsewhere, I also tried to run the update with msconfig, selective startup, only windows services active, and of course failed.