why do I lose my network connection when using my modem (Windows 2000 and XP)

I lose my network connection everytime I use my modem (Windows 2000 and XP).
Anyone have a solution to the problem.
I'm using Dell Computers with thei built in modems.
Barry GrossmanSr. Software QA LackeyAsked:
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Can you elaborate a little bit more on the problem...

What sort of network connection. is it a home LAN or is it a domain. What are you using your Modem for just dialup internet. etc etc.
The problem is the binding order.  If you open your network connection, advanced, somewhere in there you will see binding order.  You need to make sure that your LAN adapter is higher than your modem.

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PC modem are for dial-up, and not something beyond that... like ADSL, which is the most basic plan for internet.
Barry GrossmanSr. Software QA LackeyAuthor Commented:
But the partially was my fault.  I was not specific enough with the question.
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