Since it seems nothing is showing your system doing something, and you probably are not showing internet activity, it must be doing something, or going somewhere incorrectly and needs to work back. If these are unstalls needing and internet connection, it may be that showing things down. I suppose you could check that by disconnecting the network and see what happens.
If there is something wrong with the Windows Installer, we may be able to replace that, but I will have to check.
You have opened an Administrative Command Prompt and typed SFC /scannow
Let it work and see if it shows any errors.
If it was me, I would download Process Monitor from SysInternals, set it up and start monitoring just before you click the...