Microsoft KB Archive/317039

= Nothing Happens When You Double-Click the Modems Icon in Control Panel =

Article ID: 317039

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q317039



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
When you double-click the Modems icon in Control Panel, the hourglass symbol may briefly appear, but the Modems Properties dialog box does not open.

You may also notice the following event in the Event Viewer:

Event ID: 7028

Description:

The Control Registry key denied access to the system account program, so the service control manager took ownership of the key.



RESOLUTION
To resolve this issue, follow these steps.

NOTE: After you perform this procedure, you may need to reinstall your modem.  Log on to the computer as Administrator. Click Start, point to Settings, and then click Control Panel. Double-click Ports, and then delete all Component Object Model (COM) ports in the Ports list. To do this, select a COM port in the Ports list, and then click Delete. Click OK to confirm the removal of the port. When all COM ports have been deleted, click Close. Quit Control Panel. Click Start, and then click Run. In the Open box, type regedt32, and then click OK.WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

</li> In Registry Editor, click anywhere in the HKEY_LOCAL_MACHINE on Local Machine window.</li> Navigate to the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Modem\Enum

</li>  Note the name of the modem key in the right pane of the Registry Editor window. The modem key name is next to Root and is in the following format, where  is the name of the modem key:

Root\ \0000

For example, the modem key for a generic 28.8-kilobits-per-second (Kbps) modem (MDMGEN288) is displayed as follows: <pre class="fixed_text">  0:REG_SZ:Root\MDMGEN288\0000 Count:REG_DWORD:0X1 NextInstance:REG_DWORD:0X1 </li> Navigate to the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum

</li> On the Security menu, click Owner.</li> Ensure that Enum is displayed next to Registry Key, and then click Take Ownership.</li> On the Security menu, click Permissions.</li> In the Name list, click Everyone.</li> In the Type of Access list, click Full Control.</li> Click to select the Replace Permissions on Existing Subkeys check box, and then click OK.</li> In the Do you want to replace the permission on all existing subkeys within Enum? dialog box that appears, click Yes.</li> Under the Enum subkey, double-click Root.</li> Under the Root subkey, click the key with the name that you noted in step 9. For example, if you noted MDMGEN288 in step 9, click the MDMGEN288 key that is displayed under the Root subkey.</li> On the Registry menu, click Save Key.</li> In the File name box, type saved modem key, and then click Save.

NOTE: You can restore this registry subkey by double-clicking the saved modem key.reg file that you created.</li> On the Edit menu, click Delete, and then click Yes to confirm the deletion.</li> <li>On the Registry menu, click Exit.</li> <li>Restart the computer.</li></ol>

Keywords: kberrmsg kbprb ocsso KB317039

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