If it is cable ( rj45 ) then you will need one of these. click here. This will take the cable signal and when programmed send the signal wirelessly to the other computers. The two computers would need a usb transmitter receiver each. So 2 of these click here
Both can be ordered on the web but picked up at your local store. You will then get the cheaper price.
If you wanted to hard wire the router to the main PC. Then you could use a click here. This would take a hardwired ethernet cable from the router and convert it over to usb.
Easy set up and simple use a Linksys router usb from your main PC and a Linksys usb wireless adaptor from your win 98 machine. you might have to play around with setting to get file sharing but internet should be easy.
If I have read your thread correctly your modem is coax fed and a usb lead connects the modem to your pc(are you connecting via your set-top box?). If this is close then I'm not so sure that there are any manufacturers out there that do a USB router. Quickly looking at the NTL site it would appear that there is the option to have either the USB connection or the standard ethernet type.
I would suggest that you speak to NTL about changing your modem to an ethernet type and then you can explore using a dsl router
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