Try pinging the card using the loopback address of 127.0.0.1 and see if the PC gets a response from the card. If that works, try pinging your router. You could also try another network cable. I've had them go bad, especially the ones that I have made - they can get loose on the ends. You should see the activity light on the card working when you plug in the cable so it's either the cable or the network card. I've had the cards go bad too, and usually with no warning where they work one minute and the next they stop, never to work again. They'll show up as okay in Device Manager, but will never show activity. Also, most cards include troubleshooting tools with their software. Sometimes they're on the CD and sometimes they install into the software's directory in the Program Files folder. Their tools may help troubleshoot the issue. Being an older PC, you could also try removing the card and re-seating it. Sometimes they'll creep out of their sockets. I had an old Windows 98 PC that would do that with different cards whenever it was moved.
Hello everyone, I have an old Dell Dimension 8100 that originally came with Windows 98 Second Edition. It had been upgraded to XP when I got it and networking worked perfectly. After I got it, I downgraded back to Windows 98 SE for use with DOS gaming. Since downgrading I have had trouble with getting Windows 98 to use it's integrated 3com 3c920 card for a network connection. I installed the original dell driver that came with it. Device manager says that the device is working properly, but when I plug the ethernet cable into my network, nothing happens. It may also be important to note that the network activity indicator does not appear in the system tray weather the cable is plugged in or not. It can't be the router because It worked fine when WinXp was on this computer. Any help would be appreciated. Thanks!