Help setup proxy server for Firefox 3.6

Was going to run an online antivirus program ESET NOD32, but im required to run it through a proxy server. i know its not rocket science to set it up, but im unsure of what websites to trust in finding legit free servers to use. and a lil setup explanation would be helpful as well. thx

i got it figured out. no more problems.

Make sure Windows is fully updated using Windows Update, and include IE8. Use IE8 for the ESET scan, but keep Firefox the default browser

A normal client configuration is like A proxy implementation is more like the systems are configure such that the router performs a port forward of ports(x,y,z) to the proxy system
and thus the clients can not get replies from the ISP on those ports.
The clients are then config'd to use the proxy for ports(x,y,z) which will be able to send/reply to the web.

The content filtering, whitelist/blacklist rules and A/V system runs on the proxy system and protects ALL clients using the proxy.