Proxy GPO

http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/gp/718.mspx?mfr=true
http://www.windowsitpro.com/Article/ArticleID/42660/42660.html
http://www.pcreview.co.uk/forums/thread-1437893.php


User Configuration/Windows Settings/Internet Explorer Maintenance/ "Connection

Disable changing proxy settings

User Configuration\Administrative Templates\Windows Components\Internet Explorer
disable changining proxy seting.s enable.