Kernel crashes with Dell Latitude 510 & Fedora 4

I am really at a lost with my modem installation under Fedora 4 core 
Linux on a Dell Latitude 510 laptop.

I installed hsfmodem drivers both for the 2.6.11 kernel,
hsfmodem-7.18.00.07full_k2.6.11_1.1369_FC4-1fdr.i686.rpm

and 2.6.13 kernel
hsfmodem-7.18.00.07full_k2.6.13_1.1532_FC4-1fdr.i686.rpm

Both of them crash the kernel: at the subsequent reboot, kernels go to 
panic during the initial loading of "storage network sound" modules 
(right after the word "sound" appears).

I tried to exclude all Alsa sound module loading (i.e. removed all .ko 
files from the /lib/modules/2.6.[version]_FC4/kernel/sound/core/) during 
boot, but still the kernel crash persists.

Any help?

Thanks in advance,
Federico

 From scanModem (listmodem.sh gives several error under the usual 
bash...strange):

PCIBUS=00:1e.3

Providing detail for device at  00:1e.3
  with vendor-ID:device-ID
            ----:----
Class 0703: 8086:266d   Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW 
(ICH6 Family) AC'97 Modem Controller (rev 03) (prog-if 00 [Generic])
  SubSystem 14f1:5423  Conexant: Unknown device 5423
        Flags: bus master, medium devsel, latency 0, IRQ 5

                  -----PCI_IDs-------                    --CompilerVer-
    Feature List:  Primary  Subsystem Distr  KernelVer   kernel default  CPU
 ./scanModem test 8086:266d 14f1:5423 redhat 2.6.13-1.1532_FC4  4.0.1 
4.0.1    i686
              From records, 14f1:5423 has soft modem codec CXT
 The Subsystem PCI id identifies a ConeXanT CXTnm codec.
 Support is ONLY available the hsfmodem software from 
http://www.linuxant.com/drivers
 Low speed test drivers are free, but full speed drivers have a one time 
fee.
 Support is NOT available through ALSA or Smartlink modem drivers.

./scanModem: line 928: lsmod: command not found
Extended modem ID: codec=1 LIN1
Modem status     : PRA(GPIO) PRB(res) PRC(ADC1) PRD(DAC1) PRE(ADC2) 
PRF(DAC2) PRG(HADC) PRH(HDAC)
 The modem has a Conexant codec: CXT
   BUT  is not yet supported by Linuxant code.

./scanModem: line 3293: lsmod: command not found