If you're on a domain and you can log onto a machine as administrator, here's how to quickly update each PC.
Update one machine and export the
[HKEY_LOCAL_MACHINE\SOFTWARE\Eset\Nod\CurrentVersion\Modules\Update\Settings\Config000\Settings]
key, and edit and delete all except the un/pw (example below)
Download Psexec from Sysinternals.
then go to the cmd line and type.