If it worked once, it will probably work again. Try this...
Get out your motherboard cd and browse it to see if there are USB drivers on it and reinstall them. If not, go to the motherboard website, look up your m/b model number and you might find that there is a USB patch available for W98SE ONLY available for download. I found one for mine when I ran into this problem before.
I would also suggest that you uninstall all the printer info, unplug the printer from the USB port, and shut down the computer and reboot it with it still unplugged. Now reinstall the printer stuff from the cd that came with it, leaving the printer plugged into the POWER outlet only. Then shut down again, reboot to the desktop, and plug the USB port back into your printer. Windows should come up with a 'found new hardware' window and let you know it's installing it and when it's ready.
I don't know of very many USB devices that don't require that the drivers and software to be installed ahead of time before trying to plug in the USB plug.
I bought Lexmark X1150 all-in-one printer that has a USB connector. I am using Windows 98SE OS which dont seem to accept this USB connection. I read the "USB PORT" problem that the person before me was having when I inquired about the "must ask" on this page near the bottom. I went to that "USB" website hoping I could find a solution to my problem. I did however found out that Win98SE and USB printer connection are problematic but could not find a solution. I also came across the possiblilty of problems if using an "ATHLON" mobo, which I am using, but no solution. I have a 1.1 gig Athlon AMD Tbird mobo, using Win98SE OS, 368 meg of mem and a 40 gig HD. What other than buying another printer can I do to connect this all-in-one to my 'puter. The strange thing about this is it was printing, actually printing,until it came up with an error message, [drivers not install, printer not connected]. Whatever happened, please help me. Georq