Microsoft KB Archive/155319

= Cannot Install Modem After Removing and Reinstalling RAS =

Article ID: 155319

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q155319



SYMPTOMS
After you remove and reinstall the remote access service (RAS) in Windows NT 4.0, the Install New Modem Wizard may be unable to detect your modem.



CAUSE
Removing and reinstalling RAS in Windows NT 4.0 causes the Modem.inf file to be overwritten. Any changes or modifications made to the previous Modem.inf file are lost.

NOTE: The Modem.inf file is not overwritten during the normal Setup process. During Setup, the current versions of the Modem.inf, Switch.inf, and Pad.inf files are not altered, and new versions of these files are saved as Modem.new, Switch.new, and Pad.new.



RESOLUTION
If your modem is not on the Windows NT 4.0 Hardware Compatibility List (HCL), use one of the following procedures to install your modem:


 * Obtain an .inf file that is designed for Windows NT 4.0 from the modem manufacturer. Follow the manufacturer's instructions for installing the modem in Windows NT 4.0. Contact the modem manufacturer for assistance with this procedure.
 * Install your modem as a standard modem using the following steps:
 * In Control Panel, double-click Modems.
 * The Install New Modem Wizard starts automatically if you have not installed a modem before. If the wizard does not start automatically, you have installed a modem previously and you should click Add to start the wizard.
 * Click "Don't detect my modem; I will select it from a list," and then click Next.
 * In the Manufacturers box, click Standard Modem Types. In the Models box, click a model that corresponds to the speed of your modem, and then follow the instructions in the Install New Modem Wizard.

Additional query words: prodnt dial-up networking DUN

Keywords: kbsetup KB155319

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