I'm seeing quite a lot of random words highlighted, look like weblinks, when I hover over them it's all advertising.
(Plenty relating to Apple)
This can happen on whatever webpage I'm viewing even here on the forum.

What's causing it?
How did it get there?
How can I get rid of it ?

I've been noticing a real troublesome slowdown with my PC especially when I typing something. It will often miss out letters.
I've also noticed posts going missing, maybe due to delay when hitting keys.

Any of the experts out there who can help me? Pleeeeeeeeeease