Dare I pose the obvious question...is there a specific reason you are so concerned about the security of your machine being compromised?

There are a lot of comments to make about the various...

This is one of those where the symptoms can be caused by loads of things. Whilst the suggestions around doing things with the router are valid, I'd prefer to start from the Operating System's side....

Apologies I haven't been able to come back between your posts.

Let's try something really simple, again, just in case we're missing the wood for the trees: have you tried to rebuild the icon cache...

What behaviour allows all icons to display, simultaneously? Or am I misunderstanding and, whilst you mean that each different icon can be displayed (at a given point), not all together?

My line of...

The router - in its capacity as a DHCP server - is providing internal IP addresses, for use on your LAN. The question around whether a static internal IP address is an alternative isn't really one...

I'm going to start with a very basic suggestion - have you tried increasing the size of the taskbar? In Windows 10, the two settings with taskbar two-rows-tall are almost the same size: the only...

I don't want to 'wade in', but just wanted to offer my viewpoint - having read the discussion thus far.

Remote system management - of any kind - inherently carries an additional risk to on-site...

Sorry to respond to this after such a long time - but I'm glad you were able to make some progress!

In general, I'm glad things are functioning now - although if you want us to go further into it,...

Really simplistic first step - but can you replace the DNS name in the network path with the IP address of the server and confirm if there is a different result?

So, if you have...

It sounds to me like Firefox is being routed to att.com by a function in the EXE. The following guide might be worth following:

Wrong home page opens when I start Firefox - How to fix | Firefox...