Sorry, my mistake.
No problem.
Unfortunately, the machine.config files weren't the only ones that were corrupted.
Please run the following commands in the command prompt as admin.
copy C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\web.config c:\backup\Framework\web.config
copy C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG\web.config c:\backup\Framework64\web.config
del C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\web.config /f
del C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG\web.config /f
copy "C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\web.config.default" "C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\web.config"
copy "C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG\web.config.default" "C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG\web.config"
And then run this command again:
dism /online /disable-feature /FeatureName:NetFx3
When done, take a screenshot from the command prompt window again and share it here please.