Do you have a 98SE upgrade disk?
It is a pity the added files can't be downloaded instead of needing a CDRom.
Which ADSL provider are you going for?
I was using win95 but had to upgrade to win98 to use NTL BB but win98 1st edition was good enough, I guess it was to do with using USB.
It might be worth contacting the provider to check that SE is definately required to save the hassle.