A week ago my QGIS wouldn't start anymore. When I double click the desktop shortcut nothing happens. When I run in from the .exe in the bin I get the error that some DLL files are missing. These files are however present in the map 'apps'.
On this forum several suggestions are given. I tried booting from the qgis.bat file, but that does not work. I also tried uninstalling QGIS and deleting all temporary files to ensure a clean re-install. Also does not work. I tried installing older versions, but they all give the same error.
One thread also suggests modifying the .bat file by adding : PATH %systemroot%\system32; %systemroot%; %systemroot%\system32\wbem after @echo off. Also didn't work.
Lastly I installed the latest Microsoft Visual C ++ which also had no effect.
I use a Windows 10 pro edition 64 bit on my desktop. I'm not sure, but I think QGIS stopped working after a major update. When I went back to before the update, QGIS still wouldn't work however.