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!