Have you ever attempted to install an application to your windows mobile device and been frustrated by the following message?

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

With Windows Mobile 5, Microsoft introduced tighter security requirements for software. These security requirements lock down the device's installer to trusted applications (applications that are packaged with a valid certificate from a trusted source). I was contacted recently by a reader who encountered this message when attempting to install the latest version of Google Maps.

You can change these settings by editing the Windows Mobile device registry directly:

• Use a Windows Mobile-based registry editor to navigate to HKLM > Security > Policies > Policies > 0000101a
• Change the key value from 0 to 1

SKTools allows you to make this registry change from a safe, controlled menu option:

Open up SKTools, tap Tune UP! Tap the right arrow that is shown on the lower right hand side of the screen until you see the Security tab	To remove the security requirement, tap "Disable warning when installing non-certified applications" Tap the down arrow to the right of the selection box and select Yes
	.

After you've changed the keys, tap Done to return to the main SKTools menu, then exit the application either by tapping OK at the top of the screen or by tapping Tools > Exit.  Perform a soft reset to apply the settings.

To turn the security requirement back on, you can go back to the Security screen and change the setting back to No.

See "Default Security Policy Settings for Windows Mobile-Based Devices" for a complete list of registry settings that manage the default security policy settings for Windows Mobile devices.

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