I just booted KNOPPIX 5.01 and found the following compiled kernel module files:

/lib/modules/2.6.17/kernel/drivers/usb/host/ohci-hcd.ko

/lib/modules/2.6.17/kernel/drivers/usb/serial/usbserial.ko

So you should be able to load them by opening a root terminal shell and type:

modprobe ohci-hcd
modprobe usbserial

Good Luck