Symptoms

You attempt to install Acronis Backup 11.5/11.7 or upgrade from Acronis Backup & Recovery 10;

During the installation of the Acronis Bootable Media Builder, you receive an error similar to:

File C:\WINDOWS\Installer\364afaa.msi was rejected by digital signature policy

Cause

Microsoft Windows Installer has insufficient memory to verify the .msi package.

Solution

Please apply a Microsoft Hotfix that you can download from the Microsoft knowledge base (http://support.microsoft.com/kb/925336).