I am scanning ip addresses by Angry IP scan and scanning ports 80, 8080, 443. When it founds some open ports I make list and check with Charon.... But!!!!! It says to me for all proxies that invalid HTTP: 404 not found... WHy?? I was trying to check by Proxy Checker 7.0 - the same result... can someone help ma??? PLZ!!!!!!!!!!!!!!

This is because just because a box as a certain port open, it doesnt mean its a Proxy. So the results you are getting are most likely correct, you just need to keep running it till you have more to test. For the record, no I dont use ICQ or any other Messenger program.