How to Install an Internal Modem on system

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How to Install an Internal Modem on system
Installing an internal modem is not an easy task. You have to open the computer to install modem cards. Given steps applies to all computer system.   

Shut down the computer and disconnect all peripheral devices from the computer, then remove the computer's cover.
Find a slot that matches the pins. PCI modems have fewer pins and fit into a smaller slot than ISA modems. Put new modem into that slot if it will physically fit.
First unscrew the metal plate on the slot holder on the back panel, and insert the modem in that slot.
Screw modem into slot holder if it has a screw hole.
Reconnect the monitor, keyboard, and mouse. Connect the modem to phone line.
Reboot the computer.
If Windows detects modem upon startup, follow the on-screen instructions to install the driver and additional software. If Windows doesn't detect the modem, manually complete the installation using the Add New Hardware control panel.
Follow instructions in your modem manual to configure the modem in Windows.
Adjust the modem settings to match your telephone service and personal preferences.
You can verify that your modem is working properly by using the diagnostics that are available through the Phone and Modem Options icon in Control Panel. On the Modems tab, click the modem that you want to test. Click Properties, then click Diagnostics, then click Query Modem.