Why is there ads everywhere on my computer?!?

[DunbarPappy®ϟϟ]

One aspect of using the 'Net many folks don't realize is your browser brings back "3rd party" assets, some may be tainted or include 'tracking cookies'. These follow and report your movements across the 'Net: then Ad agencies compile your behavior (a profile of you) to then send ads back at you.

You must modify your browsers 'automatic' behavior so it restricts what gets returned, for both security and privacy.

Get Firefox as your default browser & use it for everyday tasks.
The following mods help, but methods ("vectors") are dynamic, and users must stay abreast of daily threats.
FIREFOX: Tools> Options> Privacy> top drop menu set to "Firefox will use custom settings..."> Check 'Accept Cookies from sites'
â–ºUn-Check 'Accept 3rd Party cookies'.
And tick the very top box regarding "Do Not Track".

A good collection of effective add-on's (Official Mozilla) is here:
https://addons.mozilla.org/collections/d...nbarpappy/
AdBlock Plus (with 'subscription' added) & "Better Privacy" also helps defray rubbish.
►► At minimum, get the #1 item for malware prevention: "NoScript", which constrains automagically fetching & deployment of potentially tainted assets.
Bookmark and refer to this page for how it works, and how to use it when sites don't function as you need: http://noscript.net/features#contentblocking

INTERNET EXPLORER does not handle 3rd party assets very well no matter what settings you have (or anything else) and won't give nearly the control as Firefox or Chrome.
It is junk.
Use to your own detriment.