Ok Leph, here goes:
All three computers are connected to the internet, all three are running Win98SE. The IP on mine is 10.75.80.3, the one I tested was 10.75.80.4, and the other, have not tested it, is 10.75.80.5.
The computers are all connected using a Intel Anypoint Phoneline Adapter. Mine is on the motherboard, the other two are USB external devices.
I do have two lines, both can access the HSI (High Speed Internet) service and I did try connecting to the other line with no improvement, the other computer that I did test tested good on both lines. I havn't been testing the third computer because it is in another room.
I called tech support for AT&T Digital Broadband and they reccomended I uninstal the TCP/IP protocol and reinstall it. I did that and there was no change. I continue to get "Ping Transmit failed: Error code 10050"
Now the "box" that connects to the antenae that transmits the signal to the tower 1/2 mile away has an IP of 10.75.80.1 . That is what I have been trying to ping, also was not able to ping any of the other computers in my house. I have not been able to ping this computer either from the one that pings the box good.
Don't really know what more to tell you. Thanks for the reply.