XSilencerX, it sounds like you want to hack a PC via telnet. It can be done but i do not know how. I would surgest NETBIOS, as it is easier and PC's who are vulnerable to NETBIOS attacks are mainly family PC's. (Posted some links before)
Note :: Telnet is a client program used to connect to a server, so you will always be asked for a user name and password, and telnet can only connect to specific server types eg IRC, FTP, SMTP, SSH and alike so trying to connect a web page for instance will not work.