Educate yourself and get it the hell out of your computer. The Washington Post has a good primer on the increasing peril:

Broadly speaking, it describes hundreds of different programs that are often surreptitiously installed on people's computers.

The most benign forms, known as adware, display advertisements based on the computer user's surfing habits. They come from companies that are, by and large, fairly legitimate — though some resort to tricks to get people to download their software, such as cleverly worded pop-up ads or dialogue boxes. Another trick is to bury a consent agreement somewhere around page 19 of a 20-page privacy policy written in small, densely crowded typefaces.

Others are not so friendly.

Some spyware programs collect information about who's using the computer, sometimes using "keystroke loggers" that do just what they sound like they do — keep track of what you're typing to get hold of personal identification numbers, passwords and other sensitive data.

Some spyware hijacks key computer functions in a form of electronic blackmail. One oft-cited example is the program that causes the computer's CD-ROM drive to open while the monitor shows a pop-up warning that the computer is infected with spyware. The authors of the ploy direct victims to buy a "cure" that turns out to be none other than... a spyware program. Then there's the "Beast," which can give its author complete control of someone else's computer.

The most aggressive programs go beyond the traditional definition of spyware and seize your Internet browser. There is little to separate those kinds of programs from computer viruses and worms, and their origins often are the same — identity thieves and other kinds of online criminals.

With that in mind, here's what you can do to make sure that your computer does not turn into a spyware billboard:

* Prevention: Don't download free software that you don't trust completely. That includes peer-to-peer programs like Kazaa that people use to share files (like illegally copied music or bootlegged movies). File-sharing companies get a lot of money from companies that pay to have their spyware and adware piggyback on those programs;

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