Why do most of my installers fail to work?
Kevin Lau
For a while, any installers which use the Windows installer in any way, all fail to install, with the error The specified path 'C:\WINDOWS\Installer\Config.Msi\' is unavailable.
The folder doesn't exist on my machine at all. Other times, installers will throw in an error code. 
All the solutions I try to look for mention C:\Config.Msi and none of those have worked for me. As far as I remember, most of them deal with folder permissions.
I also found this previous question/solution, which did not work for me. Running msicuu just resulted in the exact same 'C:\WINDOWS\Installer\Config.Msi\' is unavailable error message, this time showing error code 1314.
Following that up, I saw that msicuu has been replaced by Program Install and Uninstall Troubleshooter, which also was not able to do anything for me. I tested on one program that fails to install updates. It suggested to uninstall the program, which it did successfully, and now I cannot reinstall it.
System info: Windows 10 x64, version 1909
John
Try the following in order:
In an Admin Command Prompt, run:
dism.exe /online /cleanup-image /restorehealthfollowed bySFC /SCANNOW. When all complete, restart and test.If option (1) fails, make a new, test Windows User Profile (Account). Log into the new Account and test. If a new Account works, you need to back up and create a new user Account for yourself.
If option 1 and 2 fail, run a Windows 10 Repair Install and see if that works.
https://www.microsoft.com/en-us/software-download/windows10
Windows 10 is running, so click on the Download button (not Upgrade Button) and select Run.
This will launch the Repair and proceed normally.
Restart when done and test.
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