is it a retail computer, gateway, compaq,
does it have a restore disk with it,
if it does then it might have drivers on it for some stuff on the computer,
that your 98SE don't have,
so before you do anything'
write down hardware in the computer,
modem, network card, sound, video,
you may need to find the drivers for them,
I am not sure if you can get them off of the restore disk if you have one,
if you don't have anything on the computer you need I would do a fresh install
but you will loose any programs you got with the computer, if it still has the same copy of windows on it, they always gave you free software with new computer, like MS word,
MS money,