BBC NEWS | Technology: "The audit surveyed more than 1.5m PCs over the past year and found more than 41m instances of adware, tracking cookies, spyware, trojans and other malicious programs. Despite the different names, these do the same thing - watch what's done on a PC and steal information about the user's activities.
A PC full of spyware used to be price people paid for visiting some of the net's more salacious sites - a kind of electronic pox. But more recently, says David Moll, head of Webroot, spyware has become so ubiquitous that it can be contracted almost everywhere. So-called "drive-by downloads" are becoming increasingly responsible for installing spyware on PCs. Programs such as Ad Aware, Spy Bot and Webroot's own Spy Sweeper can clean up PCs. "
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