Well done on all that you have, and for uploading your CBS log files
I have a feeling that this may actually be caused by a piece of anti-malware software preventing the installation by preventing the files from being overwritten.
Could you please list every piece of anti-malware software you currently have installed (eg Norton or McAfee, Microsoft Security Essentials, Malwarebyte Anti-Malware Free/Pro Edition, Windows Defender, Spybot Search and Destroy etc. etc.) Any corporate editions (I have seen the Norton Corporate Edition cause this problem before)?
Thanks a lot!