Part of the problem may be that your modem ID program is identifying it incorrectly. The modem in question is probably an HCF not HFC unit. You also might want to try moving your modem to another PCI slot if a resource conflict is hampering the install.
Here is a generic conexant driver for your unit.
http://www.conexant.com/default.sph/SaServletEngine.class/Web/driverdownload/driverdownload.jsp
Bottom of the page on the left
"Installing HCF Generic Modem on Win98SE
A. Extract generic modem driver:
- After downloaded the HCF generic driver for Win 98, extract the driver by double click on the HCF_Win9x.exe file.
B. Remove the current modem driver:
- Double click on My Computer.
- Double click on Control Panel.
- Double click on Add / Remove Programs.
- Highlight the modem driver that you want to delete and click on Add / Remove.
- Click OK to exit Add / Remove Programs.
C. Installing generic modem driver:
- Restart your computer and wait for Windows to start up. Once Windows has started, the “Add new hardware wizard” will acknowledge your new PCI Communication Device.
- Select “Search for the best driver for your device (Recommended)” and click Next.
- Select “Specify a location” and type “C:\HCF Modem” and Click Next.
- Make sure the device name is called “Generic PCI Modem Enumerator” and click Next.
- Click Finish when the installation is completed."
This page has some potentially relevant downloads
http://asiapacific.gateway.com/support/DriversModem.asp
This is likely to be an OEM duplicate for your voice modem
ftp://asiapacific.gateway.com/7508907.exe