Re: That's not all...
"I've put those instructions into a .bat file, which I run every time I shutdown."
I tried something like this, it appears that this deletes Window's Update cache, and it'll redownloads the updates after reboot, even if it doesn't install them.*?
A better workaround may to 'Hide' the update(s), and/or disable checking for updates.
One way to 'hide' the update:
from Control Panel\System and Security\Windows Update
click on N update(s) is available
right click on the update and choose 'Hide update'
One way to stop updates:
Control Panel\System and Security\Windows Update
click on 'Change Settings'
in the drop down box choose 'Never check for updates'
uncheck boxes, etc...
click [OK]
*?(Note: I didn't read technical details behind what this does and this is just the impression I got from my attempt, so I may be wrong on things, feel free to correct/improve)