Installation was unsuccessful. The program or setting cannot be modified because it is not digitally signed with a trusted certificate

Error Message

When installing ArcPad on a Windows Mobile device, the installation on the mobile device fails and displays the following error message:

"Installation was unsuccessful. The program or setting cannot be modified because it is not digitally signed with a trusted certificate."

The dialog box is dismissible, but ArcPad is not installed to the device.

Cause

Microsoft ActiveSync does not recognize the mobile device or the application being installed to the mobile device.

Solution or Workaround

1. Disconnect the mobile device from the Desktop USB port.
2. Peform a soft-reset of the mobile device.
3. Reconnect the mobile device to the Desktop PC via the USB cable and synchronize with Microsoft ActiveSync.
4. On the Desktop, navigate to Start > All Programs > ArcGIS > ArcPad 7.0 > Install ArcPad on Windows Mobile.