Relating to my post in August and Michael’s recent post, here is the registry fix in question. The fix prevents Windows Update from automatically restarting your machine if any users are logged in, thus preventing any data loss.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]
"NoAutoRebootWithLoggedOnUsers"=dword:00000001
Download: aunoreboot.reg
How excellent, thank you Dan!