Ads by Provider is a text that is seen along with certain ads when you have been infected by an adware. If you have started to notice these ads, it’s not because a virus infected you, what did infected you is a software designed to show as much publicity as possible and for the longest time possible so their creator makes money at your expense.
Browsing the net becomes a horrible experience when you’ve been infected by this kind of program, almost every click you do no matter where ends up opening up yet another window or another tab with websites you never ask for. Besides showing the Ads by Provider publicity, the adware behind it can also spy and collect data about your browsing activity. Data that will surely be sold afterwards.
As many other programs like the one behind Ads by Provider, they get installed after some other software was installed (a free one most likely). Whenever you’re browsing the internet and you see alert messages telling you that you need to update some plug-in, or you must download a new tool to play this or that video, or yet another kind alerting you about some infection on your computer, be very careful not to fall for them and never click on them… you might end up with the very infection you’re trying to avoid. Here’s an example of the warning messages you should ignore: