I have an old Gateway 2000 desktop computer that works great. I can't connect to the internet because it doesn't have an Ethernet or Usb port. It uses windows 98.
You can fit a network card (that's what an ethernet cable plugs into) into a spare PCI slot inside the system case, but Windows 98 may have a problem detecting it without a third-party driver (Windows 98 does not have as many built-in drivers as later Windows versions, and very few network cards are supplied with a driver these days).
it's a case of fitting one and see if windows 98 recognises it.You can also buy a USB card that fits into a PCI slot (drivers may be less of a problem with a USB card compared to a network card).
But you really need a minimum of Windows XP to minimise driver problems when installing new hardware devices. Very few device manufacturers support Windows 98 now.
Post back your cpu speed and ram. You can always install a dial up modem.
Get an ethernet card with Win98 drivers. You will also need the Win98 CD and a browser (IE 5.x)
i have a pci card that works great with windows 98. google: f5d7001
this card is the Belkin Wireless G+ Desktop PCI Card. works really well, and the utility that handles the card has a very clean interface, but you dont care much. give it a try.
The OP seems to have wandered off and didn't bother to post back with PC specs. But note that she says there are no USB ports. A gateway with no USB but running 98 may only be a 486 and won't have PCI.