Download and Install Malwarebytes. Download the latest version of Malwarebytes for Mac. Locate the downloaded file Malwarebytes-Mac-4.x.y.zzz.pkg. 4.x.y.zzz represents the version number. In most cases, downloaded files are saved in the Downloads folder. Double-click the file Malwarebytes-Mac-4.x.y.zzz.pkg to start the setup wizard. Mac users interested in Malwarebytes for 10.5.8 generally download: Malwarebytes Anti-Malware 4.3 Free Malwarebytes Anti-Malware is a Mac utility that helps you boost your system protection by finding and removing adware threats from your computer.
There are two answers to that question, actually three!
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How to prevent ads and pop-ups: Download and install GlimmerBlocker: http://glimmerblocker.org/
How to prevent re-direction:
Adding Open DNS codes to your Network Preferences, should give good results in terms of speed-up as well as added security, (including anti-phishing and redirects) (Full information about Open DNS is here: http://www.opendns.com/home/nobloat ) and further independent information can be read here:
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and here:
Open System Preferences/Network. Double click on your connection type, or select it in the drop-down menu, and in the box marked 'DNS Servers' add the following two numbers:
208.67.222.222
208.67.220.220
(You can also enter them if you click on Advanced and then DNS)
Thirdly: malware!
There are many forms of ‘Malware’ that can affect a computer system, of which ‘a virus’ is but one type, ‘trojans’ another. Using the strict definition of a computer virus, no viruses that can attack OS X have so far been detected 'in the wild', i.e. in anything other than laboratory conditions. The same is not true of other forms of malware, such as Trojans. Whilst it is a fairly safe bet that your Mac will NOT be infected by a virus, it may have other security-related problem, but more likely a technical problem unrelated to any malware threat.
You may find this User Tip on Viruses, Trojan Detection and Removal, as well as general Internet Security and Privacy, useful:
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The User Tip (which you are welcome to print out and retain for future reference) seeks to offer guidance on the main security threats and how to avoid them.