Block unwanted adverts and sites.
You can use tools such as "Ad-Block" and Opera users have a few enhancers for the built-in content-blocker.
To block everything in all your software is a pain, so it is easier to block at the network level.
The advantage is that 1 size fits all, and you can also block malware addresses and IP ranges.
With the help of a regularly updated (every month) "Hosts file", you can do most of the work in 1 go :ninja:
Visit http://winhelp2002.mvps.org/hosts.htm for the monthly "MVPS Hosts" file.
There are different issues depending on your version of Windows, so make sure you read the info.
HOSTS file locations
Mac OS X: /private/etc/hosts
(The HOSTS file is usually Write-protected/read-only, so you will have to change that before you can write the new one)
⭐ The most excellent "jv16 Powertools" from http://www.macecraft.com , will "Immunise" Windows PCs with the "MVPS Hosts" for you.
Good Antivirus software (like Avira) should stop you making changes, so you may have to temporarily disable, while you update your hosts file.
:ninja: A very useful extra to add to your browser, that will give you dynamic and configurable blocking with visual feedback, is "Ghostery" http://www.ghostery.com
After installing and following the setup wizard, you should open the settings and change the other options to your taste.
:sherlock: Advanced users may wish to create their own lists. Check this page http://my.opera.com/dr-flay/blog/online-anti-malware for links to lists and a converter.