AdPunisher is an browser plugin that often installs without your permission or knowledge. Once installed you will notice the following changes:
-Popup ads are randomly being displayed during your browsing session.
-Search engine and homepage have been modified.
AdPunisher can't be uninstalled using conventional methods, you will require the following tools:
AdwCleaner by Xplode
AdwCleaner is a tool created specifically for disinfection of adware: