I had this problem a long time ago with Win 98 SE and I was able to resolve this by removing all additional ISA and PCI cards that were not necessary during build. So I removed my ISA 28.8k modem, soundblaster 16 sound card, and special ISA 8-bit card that was required for the large flatbed scanner leaving just the video card and motherboard as the bare necessities of Plug & Play guts. I was then able to install Win 98 SE and then add the cards 1 at a time with system shut down and fire it up for it to be detected by the system or have to manually configure it, always introducing 1 card at a time per shutdown and reboot, so that there were no conflicts.