Cannot connect to one specific website

[Fed]

I would download a fresh Firefox.

I'd set IE back to all default settings.

I'd then uninstall all browsers including IE via the control panel.

Then I'd run ccleaner, both the cleaner & registry cleaner.

Then I'd install the downloaded Firefox refusing any options to use IE settings.
I can't remember if those install options exist in Firefox but I'd be looking for an untainted install.

Then I'd test Firefox and if it worked I'd enable IE & test it.

Great thread Howzer.

[Fed]

I have done most of the obvious, like rebooting the computer, modem, routers (have even started with a fresh router firmware flash)

Bearing this in mind have you tried resetting the router to factory defaults which I guess is different to rebooting it and a firmware flash may well carry over the current settings too.
I just looked at mine it it can be reset to factory defaults via the software & if my memory serves me it also can be reset via a little hole to poke a paper clip in or something.
I think I'd try the router before I tried all the browsers in my previous post.

[Geek-9pm]

Fed, read all the thread. Router was eliminated. If he boots Linux, the problem does not exist.In nis inside Windows.

[GlitchPC]

Well...a week has passed.  Wonder what the status of the OP's issue is, now?