Re: prevent boot order and dual boot?
Nope, you can still do those things outside of the Windows enviroment.
1. All they need to do is pop in the install CD, boot to it, and off they go. You can create a dual boot irregardless of your administrator settings.
2. It's simple enough to change the boot order. Just reboot and press delete and you can enter the BIOS and change them to your liking. You can also press F8 during boot to access the boot menu.