Mohamed,
First, is it XP Pro or Home? Second, when you say you can't connect to the data, when it tries to start up, are you getting the tall rectangular error message?
If the computer can "see" the server "main computer" and not find the data, then it would sound like it is a firewall issue. Once again, always think firewall. I would, if you haven't already, turn it off completely and make sure all antivirus software, firewalls, Internet suites are off. I don't see how, because the others get through, but the only thing between you and the data on SQL Server is port 61067. I believe that is the number. You may want to make sure it is open on the firewall. Again, the others get in. If you look at the Windows firewall on the main pc, and go to Advanced and Exceptions, you will probably see Amazing Charts listed.
Also, if you go to Amazing Utilities on your BAD pc. Forget the big buttons. Go to the top one that says Advanced. There is a button there for checking your speed. Again, sounds dumb since you aren't connected, but maybe try it anyway. Sorry for the dumb advice.
As far as pinging goes, you should do it anyway. You should get used to doing command line commands. Do the >ipconfig and >ipconfig /all Look at the private IP addresses and public. Look at the DNS. Just to learn this stuff. Ping the "server" by typing >ping 192.168.0.4 or whatever. See the four packets go four times or see time out. These steps will help you learn more now that you are having issues.
And Indy...Everyone? Yikes.
