If you can't type, or you get an error, your modem is not set correctly. If it is working, install the software. Configuration Making an internal modem work can be a real nightmare because of IRQ and COM Port conflicts. Your modem cannot share an IRQ or a COM port with any another device. To change your modem settings, you'll need your manual.
Most modems come configured for a certain setting.
If this doesn't work and causes conflicts, you'll need to change it. Again, consult the manual for the jumper configurations. Other modems have DIP switches. During installation of the modem, you will be asked to select what type of modem you have from a list. Try to pick the exact modem.