Windows

It sound like the workstation is setup to dial-up when network is not detected.

Check the Internet Option from the control pannel.

Start->Setting->Control Panel->Internet Option.

Click on Connection TAB and change the setting for your dial-up accordingly..

Sounds like you might have a program running at start-up which automatically tries to get a connection. Check the "Startup" list in your System Configuration Utility. This is a tool in your System Information in Accessories->System Tools. Unchecksuspect programs or tasks to see if you can find the culprit. Then restart Windows. Good Luck.

Point value changed by question poster.

I have seen this on machines running Getright or other download managers. if your computers are running any one of those programs then you have to configure those not to automatically dial your net connection.
If no such programs are used try to see what programs are in your Startup directory. One of those programs might be trying to access the Internet.
Hope this helps.

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