I solved this by deactivacting the windows 98SE logo and editing msdos.sys with edit.com. Both my XP and 98SE QEmu guests are working without more efforts.
I only expect audio accuracy that is missing when running the 98SE. If you find the best performance configuration, please let me know.Edit1:
The only OS which I had audio accuracy is XP. Yes, why invent?Edit2:
By installing the AC'97 audio driver and rtl8139 driver all went fine with 95C, 98SE not (audio). I don't know about others.