MN-720 on w98: upnp-Problem

On Win98SE, installation of the missing upnp component fails. Manually
registering the new upnp.dll by regsevr32 fails.

Alternatively, first installing netsetup.exe from a floppy disk
generated by XP fails, since hnetwiz.dll misses a device. However, in
subsequent installation of the MN-720 CD, at least the upnp component
is no longer missing. But after reboot, mprapi.dll and samlib.dll are
missing.

In postings of the last 12 month concerning similar problems, I did
not either find a way out. Of course, during my efforts, virus scanner
and firewall were deactivated.

Are there any further suggestions?

Sven