Rodrigo,
I have not heard of the Taicom brand before.
I assume that it is a PCI software modem.
Hear are some general hints for installing software modems.
From Control Panel, Modems, remove ALL modems that are listed.
Shut down the PC, and remove ALL modem cards.
Startup the PC, and verify that no modems are listed.
Then, check add/remove programs for any modem software.
Check if the manufactures install instructions recommend installing the software before installing themodem. (very common for software modems)
Shut down, and install the modem card.
Windows should find the modem, and may ask for help finding the folder with the driver files.
Potential problems:
PCI slot conflicts, try the modem in a different slot. (remove the modem from Control Panel, Modems first)
Old drivers:
Check with both the modem and modem chip manufacture for updated drivers.
Sometimes, you need to update the chipset drivers for the motherboard to install PCI cards.
Incompatable:
While rare, I have had a couple of instances where certian modems would not work with certian motherboards.
For more help;
www.modemhelp.org
www.driverguide.com
Chas