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Windows XP, 2000
Make sure your COM port is not already in use by another modem. Click
Windows Start, Settings (for Windows 2000 only), and Control Panel, and
then double-click Phone and Modem Options. Click the Modems tab. Look
for a listed modem and check which COM port it is using. If a previous
modem is already using the available COM port, you can either use another
COM port or uninstall the modem that was installed previously. See your
previous modem’s manual for uninstallation instructions. Next make sure
that your COM ports are configured correctly. Right-click the My Computer
icon on your desktop. Click Properties. Click the Hardware tab. In the
“Device Manager” section, click the Device Manager button. Look under
Ports (COM and LPT). If the Communications ports have yellow exclamation
points or red Xs over them, your COM ports may be configured incorrectly.
If this is the case, you may need to contact your computer manufacturer. It
is also possible that you may be plugging your external modem’s cable into
a disabled serial port. Refer to your computer’s manual for information
about enabling COM ports. This usually involves altering the BIOS settings
and possibly the operating system. You may need to call your computer’s
manufacturer to change your BIOS settings if they are incorrect.
Windows Me, 98, 95
Make sure your COM port is not already in use by another modem. Click
Windows Start, Settings, and Control Panel, and then double-click
Modems. If you have Windows Me and you do not see this icon, be sure to
select View All Control Panel Options. Look for another modem listed and
if another modem is listed, click the Diagnostics tab to find out which COM
port it is using. If a previous modem is already using the available COM port,
you can either use another COM port or uninstall the previously installed
modem. See your previous modem’s manual for uninstallation instructions.
Next, make sure that your COM ports are configured correctly. Right-click
the My Computer icon on your desktop. Click Properties. Click the Device
Manager tab. Look under Ports (COM and LPT). If the COM ports have
yellow exclamation points or red Xs over them, your COM ports may be
configured incorrectly. If this is the case and you are not sure how to
properly configure your COM ports, contact your computer manufacturer.
It is also possible that you may be plugging your RS-232 modem cable into
a disabled serial port. Refer to your computer’s manual for information
about enabling COM ports. This usually involves altering the BIOS settings
and possibly the operating system. You may need to call your computer’s
manufacturer to change your BIOS settings if they are incorrect.
Windows NT
Click Windows Start, Settings, and then Control Panel. Double-click Ports.
Make sure the port you are plugging the modem into appears in the list. If