Error after installation

I tried installing Avast and it will not run, “This application has failed to start because its side-by-side configuration is incorrect. Please see the application event log of use the command line sxstrace.exe tool for more detail”

I have a copy of the start log.

This is the free copy of the 2014 Avast. I also am told by the computer that I cannot uninstall it. I would like to uninstall it.

What os/sp?
Do you (or did you) have another av installed?
If so, which one?
Any other security related software installed?
If so, which one(s)?