Following our last communication around 3 weeks ago, when I thought that we were done and I 'rated' your answer, I tried many times to get back to you, but each time I just saw a blank white screen and I had given up. However, yesterday I received a follow-up email, so have tried again and seem to have made contact this time!
Although my original problem was solved it soon became apparent that in solving this I had acquired some new problems. I went to one of the links which you suggested and downloaded a trial version of 'Malwarebytes' anti-virus and was initially impressed that it was blocking access to potentially malicious website. However, I was receiving these 'pop-ups' incessantly with a new one appearing as soon as I had closed one - sometimes there would be 8 or 9 on top of one another. As well as this, everything had slowed to a crawl and every time I booted up my McAfee anti-virus had been disabled and I had to re-enable it.
Booting-up was (and still is) very slow, with the system regularly 'hanging up' with the hourglass symbol. If I open, for instance 'MSWord', it takes forever, with the whole system appearing to freeze for a couple of minutes or more. When I click to close a window, instead of just disappearing it clears gradually by 'scrolling' down the screen, taking 30 or 40 seconds and then leaving the 'outline' on top of the window behind it, rendering it unusable, for another minute or so.
I soon realised that the multiple 'Malwarebytes' pop-ups were a constantly repeating rotation of 7 specific I P addresses, 6 of which I tracked down to "deploy.akamaitechnologies.com" and the 7th to "fbx.proxad.net".
I tried closing Applications one at a time in Task Manager to identify which application was responsible. Eventually I had close all the listed applications and still the pop-ups continued - even then, with only Firefox running Task Manager showed CPU usage fluctuating between 29 and 100% and with Firefox closed it was between 22 and 96%.
I became so frustrated with this that I tried to delete Malwarebytes but found that I was unable to do so. Unable to get back to you, I could only wait until my trial time expired, but now I get constant pop-ups telling me that it has expired and that I should subscribe - still I seem to be unable to delete or uninstall it.
At the moment, everything is really slow with repeated 'hour glass' hang-ups lasting anything up to 3 minutes. Sometimes it hangs up permanently on boot-up or while shutting down and I have to pull the plug and re-boot. Whilst writing this message I have had to close 6 Malwarebytes pop-ups reminding me to subscribe.
Currently CPU usage is 100% with just Firefox and a McAfee background scan running.
Can you help? pB