My uncle had similar issues to his PC, he was a habitual click on every popup and download useless crap type of guy, whenever I went there his home screen was a sea of icons placed there by his latest "click frenzy".
What made things worse was when he tried to fix things without researching it first , he'd use one of these "We have detected your PC is running slow, download "this" and install" type sites which are all over the interwebs, which more often than not install a virus themselves.
I kept telling him not to, I also told him to get rid of one of his greatest resource hogs NORTON and install a free security programme like AVAST or even AVG but he refused and instead convinced himself it needed upgrading and would buy a new higher spec PC and I would get his old one for free.
Of course it would run fast again as soon as I wiped it.
The rest of the family haven't had to buy a PC in decades, so there's an upside.
It also sounds like you have a good bit of Malware on your PC. I highly recommend finding a copy of Malwarebytes or another alternative and run a scan on your PC.
^^ This, download FREE version here https://www.malwarebytes.org/dl-confirm/
I also run FREE Spybot in the background https://www.safer-networking.org/
it has a popup warning needing your attention whenever something tries to change a registry entry