Internet Junk Buster is a free Opensource Non-Caching proxy for personal use on your PC or server system for company networks or even ISPs. Internet Junk buster is a privacy-enhancing proxy that blocks ads and banners that you wish you never want to see on websites. Blocking these ADs and banners on the website diretly improves the performance on the access to the site.
While designed primarily for Linux and UNIX environments, there is a seperate installer package available for Windows. This can run on Windows XP,2000 and earlier versions (should work on Windows 2003 but not tested)