99% of someones security is not their protection, rather the smartness of what they do online. If you're smart, theoretically, one would not need protection... Now, that being said, you have special cases with USB Worms. But for adware. Rule of thumb. Only go to
Official Websites, read the EULA's, check, make sure none of the check-boxes are checked, or if they are, you know what it's doing. Read the EULA (End User License Agreement).
Now, obviously, people like me prefer having the security in case. But you cannot rely on it 100% people. If you do, don't be surprised if you get infected by adware!
(Great program to
HELP is Unchecky. It won't block everything. But it does help for the slip ups!)
Unchecky download:
http://unchecky.com/Notes for Downloading: Have ad-blocker
setup and functional. Sites like Bleeping Computer have ads that matching there's, making it slightly difficult to find the "Real McCoy".
Edit Reason: Fixed the Spelling errors