Microsoft KB Archive/900905

= The operation is unsuccessful when you try to install an ActiveX control or an add-in on a Windows XP-based client computer =

Article ID: 900905

Article Last Modified on 7/6/2005

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Tablet PC Edition
 * Microsoft Windows XP Media Center Edition 2002

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SYMPTOMS
When you try to install an ActiveX control or an add-in on a Windows XP-based client computer, the operation is unsuccessful.



CAUSE
This problem may occur if the following conditions are true:
 * The ActiveX control or the add-in is self-signed.
 * The &quot;Enable trusted publisher lockdown&quot; policy is enabled in the Group Policy Object Editor.



RESOLUTION
To resolve this problem, use the Group Policy Object Editor to disable the &quot;Enable trusted publisher lockdown&quot; policy. To do this, follow these steps:
 * 1) Click Start, click Run, type gpedit.msc in the Open box, and then click OK.
 * 2) In the Group Policy Object Editor, expand User Configuration under Local Computer Policy.
 * 3) Expand Windows Settings, and then expand Internet Explorer Maintenance.
 * 4) Click Security, and then in the right pane, double-click Authenticode Settings.
 * 5) In the Authenticode Settings dialog box, click to clear the Enable trusted publisher lockdown check box.
 * 6) Click OK.

