Well it sounds to me like the computer you are trying to get into is well protected. It doesnt respond to pings, it doesnt run telnet, finger, or ftp, it doesnt run any services, and the firewall closed off all open ports. I think this is the kind of machine that is extremely difficult to break into. The trick is to find a computer that is running vulnerabe services. Theoretically it is possible to get into this machine, but it might not be very likely.