There are several important things you can do to help reduce your risk of infection:

-Keep your operating system, browser, and anti-virus software up to date.

-Only download software from websites you trust.

-Be cautious when clicking on pop-up advertisements.

-Be skeptical of offers that seem too good to be true.

-Be wary of clicking links from unknown senders in email and instant messages.

-Whenever downloading or installing software, read the license agreement and policies carefully.

Source: stopbadware.org