Windows NT 4.0 modem troubleshooting

Updated: 01/24/2018 by Computer Hope

External computer modemBecause Windows NT is a non Plug-and-Play operating System, it is extremely unlikely when installing a modem that it will be automatically installed. The steps below are instructions for installing a Modem in Windows NT.

Ensure you have Windows NT drivers; it is very common for modem manufacturers to only ship Windows 95/98 drivers.
If you have a WinModem, contact the manufacturer to make sure it is compatible with Windows NT.
After the installation of the Modem, install the latest Service Pack.

Get into the Control Panel - Click Start, Settings, and then Control Panel
Open Modem Properties - Double-click the modem icon
Install Modem - If the modem has not yet been installed, you will get prompted for Windows NT to detect the modem. First, allow Windows NT install the Modem. If it does not detect the modem, manually install the modem. When manually installing the modem, if you have drivers press the button 'Have Disks' and specify drivers location.
Setup Modem - During the setup of the modem specify the port of the modem COM1, COM2, COM3, or COM4. It only displays available COM ports or ports currently installed on the computer.

Installing and setting up dial-up networking (connecting to Internet)

Install dial-up Networking

Open My Computer and double-click the dial-up Networking icon. (If this icon is missing, skip to Missing dial-up Networking).
You will then be required to install files onto your hard drive; point to your I386 directory located on your Windows NT CD (sometimes on the hard drive) to begin installation.
During the installation if an RAS service has not already been added, let the installation configure the RAS for you. During the installation of the RAS service you need to install the modem that will be used for the RAS service.
Once the RAS service has been installed click the Continue button to continue with the installation of the dial-up Networking.
Once dial-up Networking has been successfully installed reboot the computer to complete the installation.
Once the computer has rebooted, open My Computer and double-click dial-up Networking. At this point you should receive a message indicating no phone books have been located.

Installing a phone book

Specify the name of the dial-up Networking (e.g., the name of your Internet service provider).
Check the box 'I am calling the Internet,' and then click Next. If you receive a message about TCP/IP not being installed, cancel, and close out of all windows and skip to next section before continuing with this section.

Enter the phone number to dial your Internet service provider, Click the Dial button to begin dialing, and specify your user information and domain if required.

Installing TCP/IP and setup

Click Start, Settings, Control Panel, double-click the Network icon. Click the Protocols tab, click the Add button, add the TCP/IP protocol.
During the installation of TCP/IP you are prompted if your network uses DHCP. Choose No if your Internet provider has given you IP Settings (i.e. 127.0.0.1).
You will then be prompted for your Windows NT CD; place the CD in and specify for the path x:\i386 (where x is your CD-ROM drive).
Towards the end of the installation of TCP/IP, Windows NT will detect that RAS service is installed. Choose the option to configure TCP/IP with the RAS service. In the RAS dialog box click the button to continue.
Once back into the Network window, click the Close button; when closing, it will bring up a dialog box to set up your IP settings. Specify the IP setting provided by your Internet provider as well as a DNS setting if required.
Once completed, close the Window and then reboot the computer when prompted.

If TCP/IP is already installed or you have completed the above, click Start, Settings, Control Panel, double-click the Network icon. Click the services tab, double-click Remote Access Service. Within this window click the Network button and ensure that TCP/IP is checked.

Additional information