stumped on ISP connection

I am running Win 98. Whenever I connect to my ISP my browser opens up one page and then even though my dialup connection is still hooked up, whenever I try to access another page, I get page not found messages. This happens no matter what browser Iuse, IE, netscape, Opera. I have deinstalled and resinstalled dial up networking. I have run modem diagnostics. I have deleted my windows partition, reformatted the partition, and reinstalled windows with the same results. If I make a connection and don't bring up the browser, I can do pings and tracerts,etc. After I bring up the browser if I try and do a ping, I get nothing but timeouts. I have a Citrix dial-up connection to work and I am able to use this fine. I don't think my modem is the problem. I had reinstalled and deinstalled the OS serveral times now with the same result. I am at a loss as to what my problem could be. I have went through tech support with my ISP company and went through their diagnostics procedures to no avail. Their recommendation after all of their troubleshooting was to reload the Os which I have done serveral times to no avail. I am ready to bag this machine.