Even if you have blocks and firewalls, you can expect adware to infiltrate into your system. Take note that these things are clever enough to hide themselves into files or folders that seem harmless. The usual remover will not see them coming until later on when it is too late to stop them.
It is a different story with adware remover. If you want to be protected from these threats, you need to arm yourself with an adware remover that blocks and prevents adware from getting into your system.
The choice is ultimately yours. You can opt for the software that should be installed into your computer if you anticipate more future adware intrusion. Or you can have the kind only prevents its existence once detected initially.
Computers are not anymore safe from those who want to take advantage of another. With the endless and valuable information that they can achieve, you can expect them to come up with other means of conquering your privacy.