Hi,
I installed one of them (Conexant) then uninstalled the Toshiba Software Modem and reboted. When it started, it reinstalled the Toshiba Software Modem by default.
Yes, it installs windows driver by default that located in Windows folder/system32/driver
So my question is, is it possible to install and use anything other than my original modem?
You should install only original modem driver. If you try to install other modem driver, you will get error like ,,no compatible hardware found,,