Modem Connects but no data transfer

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Pinged yahoo.com with a working computer..got a response. Pinged Yahoo.com with bad computer and got the message "unknown host yahoo.com"
 
do an nslookup on the good computer to find the IP address of yahoo.com. Then try to ping the IP address on the bad computer and see what happens. If it works, then the problem is your name server, or lack thereof in which case the person who told you to try nslookup was onto something. BTW - also post what the "default server" is when you type nslookup from a DOS prompt on both the good and bad machine. Also try to ping it (both name AND IP address) from each box and post the results.

oh, I just noticed that you're running 98 on the bad box. I forget if nslookup works the same on 98 as 2K/XP but try anyway. Also, what OS are you running on the good box?

<i>It's always the one thing you never suspected.</i>
 
Hi Flashpoint, I feel sorry for your modem troubles, and I have had exactly the same problem for the last week or so.
I can connect to my ISP quite normally, but then no data transfers take place, and consequently no pages open up in IE6.
All my ping tests have failed also, and by reinstalling Win98SE it only made the situation worse. The techs at my ISP checked everything out that they could, and said it had nothing to do with their connections.
The only reason I can send this post is because I reactivated my firewall, and then told it to allow all traffic. I am still not sure if I will be able to connect again next time I try!
If you have found any ways of fixing this problem, please let me know.
My next step would probably to start spending money on upgrading to XP, but I dont know if even this will fix it.