AdwCleaner is one of the rare tools that scans and cleans your system of many adware, toolbars, browser hijackers and potentially unwanted programs or PUPs. They get installed without the knowledge of the user while installing some more known and popular software. They can be anything like media players, or downloading manager and any other general utility software. Their purpose is not to harm you, but eventually they end up doing just that by changing several user -specific settings and controls like in browsers, taskbar and many more. You might notice a number of toolbars being added to your desktop or some gadgets and widgets appearing on your desktop. They might cause annoying animations every time you load a web page.