Windows Large MSI MSP Install Error 1718 Event 1008

I have experienced this problem while installing WebSense 7.6.2, if you are getting Error 1718. File FileName was rejected by digital signature policy as me, the root cause of it can be the large  .msi or .msp file you are trying to install. Additionally, the following event may be logged in Application Log.

Type: Error
Source: MsiInstaller
Category: None
Event ID: 1008
Date: Date
Time: Time
User: Na
Computer: ComputerName
Description: The installation of FileName is not permitted due to an error in software restriction policy processing. The object cannot be trusted.

This problem occurs if the Windows Installer process has insufficient contiguous virtual memory to verify that the .msi package or the .msp package is correctly signed.

If you are using Windows Server 2003 you can install the fix below.

Update for Windows Server 2003 (KB925336)
Update for Windows Server 2003, x64 Edition (KB925336)
Update for Windows Server 2003 for Itanium-based Systems (KB925336)

For more information and other solutions : http://support.microsoft.com/kb/925336

Windows Installer 4.5 is available

Microsoft has released version 4.5 of Windows installer last week, new version has several new features as well:

Multiple package transaction

In a multiple package transaction, you can create a single transaction from multiple packages. In a multiple package transaction, a chainer is used to dynamically include packages in the transaction. If one or more of the packages do not install as expected, you can roll back the installation.

Embedded UI handler

You can embed a custom user interface (UI) handler in the Windows Installer package. This makes a custom UI easier to integrate. You can also invoke an embedded UI handler from the Add or Remove Programs item in Control Panel. Or, you can invoke an embedded UI handler during a Windows Installer repair process.

Embedded chainer

You can use the embedded chainer to add packages to a multiple package transaction. You can use an embedded chainer to enable installation events across multiple packages. For example, you can enable install-on-demand events, repair events, and uninstall events across multiple packages.

Update supersedence resiliency

This feature lets you correct for changes in the FeatureComponent table during supersedence.

Shared component patching resiliency during uninstall

This feature makes sure that the most recent version of a component is available to all products.

Custom action execution on update uninstall

This feature lets an update add or change a custom action so that the custom action is called when an update is uninstalled.

Source & more information at : http://support.microsoft.com/kb/942288