I've downloaded a trial copy of ACAD Electrical 2013 to determine whether we can autogenerate PLC I/O schematics via a Python script. However after download and beginning the installation process I was presented with the attached splash screen. As I'm unsure if there's an error in the downloaded file I used the Microsoft MD5 hash generator to produce the attached MD5 hash checksum.
Could be a corrupt download. Or it may be something as simple as anti-virus. Disable any real-time protection and make sure UAC is off. Install with local admin rights and clear that %TEMP% folder before running the installation again. It's always a good idea also, to make sure you are running the latest version of MSIEXEC Windows Installer.