I have never enabled Content Advisor through GPO, as from what I have read it would be easier, and quicker, to setup a squid proxy server and do things that way. Anyway someone in the past setup content advisor on all machines in one of our centres that has in excess of 120 machines. From what I can gather the config has to be setup on a machine and is then imported and distributed using Group Policies via - User Configuration -> Windows Settings -> Internet Explorer Maintenance -> Security -> "Security Zones and Content Ratings".
I am assuming things here, but once this setup is distributed via GPO's to the client machines the GPO can be removed and the settings would remain on the client machines - let me know if I am wrong.
If this is correct then what I need to do is somehow disable Content Advisor on these machines, as a proxy server is now in use and the Content Advisor is causing more problems than it's worth. If someone could advise on the best way to remove content advisor from these machines using GP's please let me know.