Since your willing to look at this now, here is the install log: http://pastebin.com/MB6dEiZD
Looking at it, its clear it had some problems. The issue is the installer said it finished successfully.
Looking at it, its clear it had some problems. The issue is the installer said it finished successfully.
The failure in that picture is that somebody deleted the file found at C:\Program Files (x86)\Backblaze\bzbui_interface.xml
That extremely simple file contains all the strings for the Backblaze GUI in all 11 languages. What your screenshot shows is what happens when that file is missing.
If you run a Backblaze installer over the top of that installation it should repair that by placing the latest version in place as it always does. If you STILL cannot get that file installed, something is going entirely, totally hog-wild wrong with your system. Hundreds of people install every day and that file is always present.
If you were running along and suddenly that file disappeared from your computer, I would stop and prepare a full restore from 15 days ago from Backblaze. This is totally free. When files randomly disappear from the hard drive, one cause might be your hard drive is starting to die.