unable to connect

[froger]

This really makes no sense to me. My secondary computer is ether netted to this machine but when I attempt to go online (regardless of what browser I use; IE or Firefox get a message that says(Firefox) "can't establish a connection to the server at my.earthlink.net" or with IE "Internet Explorer cannot display the webpage.
But I am able to sucessfully ping both yahoo and google with these results: four packets sent four packets received and 0 packets lost.
I called the ISP who is baffled as am I since the computer is online. What would produce this kind of problem and how can I resolve it? The IP (penteladata,ptd) gave up.
I don't know if this is the prop;er forum to use but I am in a q

[Temmu]

do you use a hosts file?

did you enter the url exactly like this?
http://my.earthlink.net/

you said "secondary" pc?

tell me about you network, such as:

isp ---- cable modem box ----- router ---- pc 
                                       ----- 2nd pc