Thanks for your reply.
Winaero Tweaker is now installed. :D

I downloaded the Winaero Tweaker files from the Winaero.com website and while trying to set it up I got this warning. Should I be concerned about it?
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Thanks for your comments Callender, and for the links.
Regarding the popups...I realised that looking at webpages without having them on the screen is possible in Firefox by keeping the cursor over...

Ok...I'm back! :)
The "PC App Store" was responsible for the popups on my Windows 10 computer, and also for adding to what I usually see when I click the "start" icon or search-box on the bottom...

That webpage looks about the same in my Edge browser.

- - - Updated - - -

I think I finally stopped the popups...and got rid of 245 MB of files that "PC App Store" put on my computer.
I'll...

"Maybe you clicked on a download link in an advert on the page."

BINGO!! ...and if that button wasn't for downloading the Winaero Tweaker...it must have just just for downloading popups!

That...

All I can tell you is that I thought I was downloading the Winaero Tweaker file from a Winaero Tweaker webpage. If you want the download link that I recently mentioned when I posted this.... ...

Someone at the "PC App Store" appears to have their fingerprints all over these popups, as the name is in the fine print on all the popup pics I've posted, and is in at least one of the "Winaero...

Thanks for the instructional pics Callender, unfortunately doing what's shown didn't stop the popups. :(
Pics of the popups I'm getting....
The popup in the second pic appears after I click the...

Thanks for the replies guys.

The popups started after I got a request to alter setting on my computer when I tried to download the "Winaero Tweaker" file from what I later found out was the "PC...

I tried to download the "Winaero Tweaker" via a button on the winaero.com website and ended up with "McAffee virus alert" popups that wanted me to pay for virus protection, and eventually froze my...