Can't disable "automatically detect settings"

Hello anyone who can help.

I am having problems with a home wireless network. I am
running two laptops and two desktops off of it, all are
accessing the internet via the network.

One of the laptops is constantly resetting
the "automatically detect settings" flag under Tools,
Internet Options, Connection, LAN Settings.

I have unchecked the check box, but it constantly resets
itself. I cannot connect to the internet until I go into
the LAN Settings a uncheck the box again.

Can anyone tell me how to permanently uncheck
the "Automatically Detect Settings" flag?