I was trying to help somebody with their computer, but I ran into a few problems. This is a Gateway desktop on the network in a dorm. After a lot of playing with stuff, I found that whenever I unplug the network cord the computer works fine (without the internet), and when I plug the cord in, the computer successfully receives an IP address and stuff from the DCHP server. But I can't run anything, it frezzes when I try to run something from the start menu and it just refuses to run anything on the desktop. I found that it initially had the same IRQ as the onboard USB controller, once I disabled the controller the computer worked fine with internet untill I restarted, then it did the same thing as before. I tried the NIC in all of the available PCI slots with the same thing happening. (in 2 of the slots it had conflicts with the USB, in the other 2 open slots it had issues with the sound card (Live!))
I probably left a few things out, let me know if you need to know something else.
I probably left a few things out, let me know if you need to know something else.