Whatever you do, (installing and updateting or unistalling) always as a
administratºr.
This is the key!
The installation as an admin is not enough.
You needed to login as an adm!n.
Can you gº to Windows Update, select Express (Get high-priority updates),
and apply all offered updªtes http://update.microsoft.com
Once that is finished, can you verify the update installs? There are many
pre-requisite files which are needed from windows update and signature update
with windows defender will fail until you hªve these f!les.