Adware and spyware is the most annoying type of data intrusion that anyone can have on their computer. Adware will cause unwanted pop-up advertisements, browser URL redirection, and other annoying types of advertising. Spyware can sneak into your computer and log your every keystroke, read your emails, grab your passwords and steal your credit card numbers. A good Spyware and Adware cleaner will stop this from happening and will work around the clock.