Windows Update - Win 7 Ent x64 - create batch file to install updates

Greetings, new to the forum. I apologize in advance as I'm sure this topic has been posted before, but didn't find anything that addressed this formally...

So, the idea is that my company has a ton of desktops, connected to a domain, most of which do not have over 2gigs of RAM on them. When said desktops are booting up, Windows is checking for updates, utilizing as much as a gig and a half of said RAM, which is causing these machines to slow down to the point of being largely unusable. What I'd like to do is disable winupdate to automatically start up, then have user's run it themselves, maybe on a Friday before they leave or something. I want to set this up so there's as little for them to do as possible - many of them are not technological. In other words, windows would check for updates, install the updates, restart, etc. without any prompting from the user. Any suggestions as to how to best go about this?

Thanks in advance. Toffer.