
What do these covertly installed programs do? They may log all your keystrokes and send them to the programmer so he/she can see any passwords and usernames you have typed on your computer keyboard, your online banking, etc. The other thing they might do is turn your computer into a zombie and make it part of a zombie network that allows the programmer, or someone who pays the programmer, to send spam through your machine. Very ugly stuff.
Take precautions (see my earlier article on making nice with your computer). This is a serious problem and it pays to be protected. Here's a useful extention to have that warns you if the web site you're visiting has any unpleasant or underhanded aspects, like adware, spam, etc. It goes with Firefox, which is a safer browser than Internet Explorer anyway. (I have IE, Flock, Maxthon and Firefox, each useful in its own way...see Barry's Best for a post on getting these browsers.) The extention is McAfee SiteAdvisor and can be gotten here. (McAfee is a well-known and trusted computer security company.)
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