Don't Fall For it.

There are a lot of pop-ups that tell you that there is something wrong with your computer or it is too slow in short don't pay
attention to pop ups..either they want your money, nose around in your computer or add a virus.

For example sometimes when I go to a site this puesdo antivirus shows up and says you have threats on your computer actually this so-called antivirus will list actual needed  files and say those files must be deleted.

You can test the fake antivirus by trying to close it out or click on cancel but no matter what you choose the fake antivirus will start scanning. Quick restart your computer, even you have to just turn he computer off then on (if you do the latter run a scandisk to automatically fix disk errors)

People also see pop ups saying your drivers need updated. Don't trust the pop-ups just go to windows update then click custom and they will list any driver updates that they have for your machine and it's free.

Of course, as always install the critical updates.