Errors 2275 and 1632 when you try to install software in Windows 7

When you try to install MSI based software in Windows 7, you receive an error message with codes 2275 and 1632. Both codes are related to the fact the %windir%\Installer folder cannot be created or read even if you are running the installer as an administrator. As a workaround, you can manually create the Installer folder and that solves the problem.