Your installation has multiple issues which go beyond the actual problem of this thread. If you can't open Start it might be an issue with the graphic driver (this is what I have noticed the other day). You can do Windows + X, open elevated Powershell and
run the suggested solution for app repair again. However, I assume you are facing multiple problems so you might have to tackle them independently. But start with a reinstall of the apps then try to uninstall / reinstall your graphics driver to latest version.
If that doesn't work you can still try to rollback to a previous version or do an inplace update if nothing else solves the problem. This might finally fix it, if not you have to completely reset your installation...
If Windows + X does not work you have more options to open an elevated Powershell
see here
Otherwise start Powershell (powershell.exe) from this path as Administrator
%SystemRoot%\system32\WindowsPowerShell\v1.0
or
C:\WINDOWS\system32\WindowsPowerShell\v1.0