HELP! BT Voyager 220V/2091

Evening all,
I have a slight predicament. In the house, my brother in law has both the above routers, the 220v is wired, the other wireless, he gets broadband through his company, but at present, can only be used on his laptop. I have a PC that currently runs Windows 98 1st edition, but the minimum software for the above routers is Win98 SE. Im just wanting to know, is there any way of getting either of them to work on my PC? ive tried downloading the router software manually from the disks (as auto setup just says incorrect OS), but it doesnt want to work. I bought an OEM copy of Win98 SE hoping to just replace my current OS, but as theres already a version of Win98, i cant install it. Is there a way of removing my corrent OS and get SE on? or is there something i can download to get my problem solved?

Thanks for your time guys

Luke