Hi Whiz,
You have to purchase 98SE, as it's not a free upgrade, but you can get the upgrade disc complete with licence for a few ££ on eBay.
You could go for XP, but it depends on the spec of your machine, look here for more info..
http://www.microsoft.com/windowsxp/p...g/sysreqs.mspx
Ignore the 128mB of ram bit. Realistically 256 is bare minimum, and you'd be far better off with 512.. it depends on what you are going to be running on it.
As an aside, 98FE should work fine. I had my old 98 machine running fine on BB, and the networking side shouldn't be that much of an issue, I used to connect mine to another machine for file transfers, so the next logical step would be full network access. Someone else will surely know exactly which buttons to press.. as t'were.
Cheers
Liam