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Why does my Computer Slows Down the network?

I have a network with about 15 cpu`s. The one I have a concern about is on a switch with 4 other pc`s. Whenever I turn on this one PC the whole network comes to a crawl. First we thought maybe there was a keylogger on the pc so we ended up wipeing it out starting from scratch, plus I thought I isolated the problem and found that the network card on the pc was the problem. But they are still complaining, what else can I try? Maybe its the wire being run from the IT closet to the switch? I did a speed test on 3 parts of the office and it came up with similar results. What else can I do? Thank you!
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avib27
Asked:
avib27
3 Solutions
 
joebrockmanCommented:
Have you tried replacing the NIC in the problematic computer?  I have seen a bad nic cause the problem (this is assuming you have verified there are no virus/malware issues with said PC).

Start with checking for Virus/Malware, then try replacing NIC.
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avib27Author Commented:
Thank you for the suggestions We already cleaned the computer and started from scratch. Plus we changed the NIC and the switch.
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joebrockmanCommented:
I have also seen similar issues with a bad switch, but if the problem only happens when the one computer is turned on, I would start there.
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joebrockmanCommented:
Sorry about the last comment, I did not see you had already responded.  It should not be the wire from the closet to the switch if only the 1 computer causes the problem.  I suppose it is possible there could be another faulty piece of hardware with the system, did you try moving the new NIC to a different slot on the motherboard?  I wouldn't think that would make a difference, but it is worth a shot.
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avib27Author Commented:
No problem.. Its strange right now I am on the computer talking to you and playing an online radio and everyone who is connected to the switch is fine now. When I leave "nothing works". Also someone on the other side of the office is complaining that this computer is slowing his down when its on. But it makes no sense if he is not on the switch!!
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Rick_O_ShayCommented:
Can you put wireshark on it or mirror the port and do a packet capture to what is going to and from that PC? Might give you a clue. Also have a look at what processes and applications are running on it.
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DjAriochCommented:
What other networking devices are on the network? Firewall, Router, other switches, a Hub? How are the clients getting IP addresses, DHCP? I have seen where a firewall has run out of dhcp licenses and one extra device connects and the network drops out.

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avib27Author Commented:
Thank you for all of your help i finally got it up and running smoothly with all your suggestions combined.
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