dell 4550, xp, integrated 10/100 network card. i am having trouble CONNECTING to the internet. my onboard net card won't connect at all when switched to autosense or 100mbs. so i installed a pci net card, when on autosense or 100mbs, the computer switches back and forth from "aquiring network address" to "a network cable is unplugged". both CARDS WILL connect when switched to 10mbs, i can also connect at 10mbs when i hook to the dsl box with a usb cable. seems like there is something wrong with some program that controls these THINGS. if you folks can think of anything that might help, it would be greatly appriciated. thank you.
asdf12..... Was the integrated port not WORKING or where you playing around changing settings ?
Have you been updating drivers or anything like that ?

dl65 More DETAILS needed such as router/modem, are any other machines to be networked etc.
For now, as you have been playing with rate settings etc, uninstall both NICs via Control Panel, switch off and either remove the addin card or disable the onboard card.
Reboot and Windows will find and install the remaining card.

From here it depends on what setup you have so don't do any more yet.