One XP computer having network troubles

I have one computer (our newest XP Pro SP2 desktop) that is having some network problems. We have a program that runs one master and the rest of the desktops connect TCP/IP. This one desktop keeps losing connection to the master program. The other system that desktop has trouble with is we have a new streaming video on our website. This desktop is the only one that has lag. We are connected to a new 2003 windows server. Is there a setting I should look at?
Dan PurcellManagerAsked:
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I would look at the location of that machine in respect to the others.  Here are some things you can try:

Put a known good machine in the spot of the machine having problems and hook it up with the cable that the machine having problems was using... If the problems persist, it is not the machine, but something in between the machine and the server (too far away, bad cable, etc.)  If you do not have any problems after you swap out machines then at least you know for sure it is something on the machine (bad nic, incorrect setting, etc.).  Hope this gets you started.
Dan PurcellManagerAuthor Commented:
Thank you, I will try that
I would firstly try a new network card in the machine.  They aren't that much so you can easily go get on.  

Also could be to much traffic coming into the machine maybe.  Try slowing it down to 10Mbs instead of 100Mbs and see if that happens still!

The speeds of the network card can be found under the properties and in general tab --> configure -->  advanced --> link speed & duplex!

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