This is a general explanation about different kind of online threats. What they do, and how. Introduction to viruses, malware, worms, adware and others.
PUPs (for potentially unwanted programs) are harmless by design, most of the time. Here we will study a case where such program behaves like a rootkit.
Got infected with PUP (Potentially Unwanted Program)? Follow this step by step guide to get rid of it, and learn to avoid next infection.