Close to torture, seems like.
If you really want to complete your pain [basically throwing the last straw on your neighbor's keep-the-current-programs hopes], you could try giving that setup what it wants = start by disabling the onboard video, sound, and lan on the new motherboard, and using the older video card and SoundBlaster. Leave Norton and the SoundBlaster drivers in - at least at first (reinstall them if necessary), and remove the Enum key & try either an over-the-top from there, or a wild hardware detection ride. It might come out with original programs intact with the original sound and video. --> Then you could chance removing them one at a time & trying the onboard.
The nForce2 boards are a little kinder to Win98se than that original nForce-220 that you're working with. One of the stumbling blocks is often the sound - on one board I seem to remember a patch was necessary to get decent sound in Win98 (I believe I found the patch at the mobo's website). I imagine the SoundBlaster might be fine to leave in, it certainly won't be any worse than the onboard. And you might avoid a bunch of problems by using it.
Other than trying that method, at least your neighbor qualifies for the $80 upgrade version of XP Home. If the son happens to be a full-time college student, he might qualify for the $90 academic version of XP Pro.
It partly depends on your pain theshold
. . . Gary