What is a deffinate working proxy?
Free proxy servers are almost universally run by hackers looking to steal your personal information and to plant malicious code on your computer. They win either way. They get to use your computer and IP address to run their hacks and spam through, with you to blame somewhere down the road or they steal your identity and make life miserable for you. If they get lucky they get to do both to you. There is a reason they are free. Bandwidth costs money and nobody gives it away for nothing.