OK, first to answer BetterRed: When I double-click on desktop shortcut, the progress circle appears for a second or two, then goes away, but the Sigil application never comes up - doesn't start. The same happens when I try double-clicking on the executable file itself, (C:\Program Files (x86)\Sigil\Sigil.exe).
Following Doitsu's instructions, I looked for a sigil-ebook folder but did not find one - originally when I first had the problem, I'd uninstalled Sigil 0,8,1, I'd found a sigil-ebook and deleted it, but ever since re-installing Sigil several times and not being able to start the program, I imagine a new folder did not get created again. Anyway I made sure I had all versions of Sigil uninstalled again, then downloaded DiapDealer's versions of the program - 0.8.0 and 0.8.1 both, from the link you gave. I installed 0.8.1 first. This time during the installation, a dialog box came up saying it was "repairing MS Visual C++ 2013 Redistributable ...." Once the installation was done, I tried launching Sigil from the desktop, again no success. Same problem with trying to launch from the executable itself. Rinse, repeat (uninstall, clean out everything that may be Sigil, reinstall, this time using 0.8.0). No "repair" notification this time, but I believe the redistributable got installed again. End result is the same, I still cannot launch the program.
Could it be that the MS Visual C++ is at fault? When I look in my Control Panel list of installed Programs window, I see several versions of this program, all the way from 2005 to the latest: Microsoft Visual C++ 2013 Redistributable (x86) -- 12.0.21005 , which got installed with the very last installation of Sigil.
Since this problem occurred, I have also run complete scans of my system, with MS Security Essentials, MalwareBytes Anti-Malware, Eset Online Scan, and cleaned it out with CCleaner as well. Still no change to the fact that Sigil will not launch.
Anything else I can do to help identify the cause of the problem, please do advise.
Thanks everyone for your kind help!
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