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Install, configure, and manage modems. A modem is a device that makes it possible for computers to communicate over telephone lines. The word modem comes from Modulate and Demodulate. Because standard telephone lines use analog signals, and computers digital signals, a sending modem must modulate its digital signals into analog signals. The computers modem on the receiving end must then demodulate the analog signals into digital signals. Modems can be external, connected to the computers serial port by an RS-232 cable or internal in one of the computers expansion slots. Modems connect to the phone line using standard telephone RJ-11 connectors. Check Device Manager to see if the modem is listed and working properly if not reinstall drivers, if this does not work:   Check for conflicting IRQ's Check port number Check that card is seated in the mother board properly Install, configure, and manage Infrared Data Association (IrDA) devices. Most internal IrDA devices are installed by Windows 2000 Setup or when you start Windows after adding one of these devices. Installing an IrDA device if it was not installed automatically by Windows after restarting your computer. Install the internal IrDA device or Attach the IrDA transceiver to the serial port. Open Add/Remove Hardware. Click Next. Click Add/Troubleshoot a device, and then click Next. In Devices, click Add a new device, and then click Next. Click No, I want to select the hardware from a list, and then click Next. In Hardware types, click Infrared devices, and then click Next. In Manufacturers, click the manufacturer, and in Infrared Device, click the infrared device. If you have an installation disk for the infrared device, click Have Disk. Click Next, and then follow any additional instructions to install the device.