For the past two summers I've been an intern at my local county's IT department. Last year, I helped get rid of ~40 Windows XP computers in favor of brand new HPs that were downgraded from Windows 8 to 7. I even got to install a second 4GB of RAM in each one, along with asset tagging them. It was a pretty fun day.
Now the county libraries are a different story. Their public computers are running Userful[1] which is a Linux OS that allows one desktop tower to power multiple workstations. I wish I checked the version, but as I can recall, they looked a little outdated.
Here's the reason why Ontario libraries started using Userful [2].
[2]: http://www.userful.ca/press/ontario-libraries-power-consumpt...