Help to install drivers

I tried install USB to RS-232 converter driver(USB to UART Bridge driver
that required for RFID device). Device come with drivers, can be downloaded
from manufacturer's site. I'm not sure it will work on Windows 98SE. I just
think it should work.
CP210x Windows Driver v4.40 Copyright (C) 2007 Silicon Laboratories, Inc.

USBDriver's folder contain a lot of files:
----
x64 folder
x86 folder
P210xVCPInstaller.exe
ReleaseNotes.txt
setup.ini
stabbus.cat
stabbus.inf
slabser.cat
slabw2k.inf
----
I tried run P210xVCPInstaller.exe application, but when run, it show "Error
starting program"
(CP210XVCPINSTALLER.EXE file is linked to missing export
SETUPAPI.DLL:CM_Get_First_Log_Con..), probably not work on win 98.

I tried install drivers by attaching device to USB port, this launch "Add
New Hardware Wizard", the steps require specify which drivers install, and
where to get it from, then insert CD or floppy, or specify files location,
as drivers are in folder, I browsed for folder, point to drivers location,
but this not work: after pointing to driver location(UsdbDriver folder with
above mentioned files), then OK, it show empty dialog:

http://img265.imageshack.us/img265/4729/addnewhardw.jpg

I tried also write driver files on floppy, same result.

Thank you.