Use this 3 step process. Guaranteed fix!!!
1. - Blow away the Win98 box.
2. - Reload with Slackware.
3. - Make bootdisk with Linux.
I mean why even make a bootdisk when you can blow the whole system away and boot to CD?
I suggest reading my post in General about the Slackware Live CD.
Download that CD, burn it, boot off of it, and then make your boot disk if you really need to