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Spyware can be more than an annoyance. Poorly programmed spyware can interfere with other programs and can even cause system instability. Privacy issues are at stake as well.

Spyware is often installed without your knowledge or consent and in many cases can’t be removed from your computer without specialized software tools. When the people that distribute it need to resort to tricking you into installing it, there’s obviously very little there to warrant your trust.

Your first line of defense is common sense. Be careful when you install new software. Only install software from trusted websites, and always read the license agreement. Some companies disclose that they install extra things with their software, but most people don’t read the license and never know it.

Check for “spyware free” guarantees on software you download. Obviously, anyone can say something is spyware free even when it isn’t, but if a website has gone to the trouble to say so, it is more likely to be safe than if they hadn’t.

What are the signs of a spyware infection? Odd pop-up advertising, a new homepage when you didn’t change it, new toolbars that you didn’t install or your computer is responding slowly or rebooting randomly all of a sudden, to name a few.

If you do get infected with spyware, there are ways to get rid of it. A number of companies make software designed to get rid of it. These programs will scan your computer and check through their database of known spyware for any matches. These databases get updated frequently as new forms of spyware are found.

Many are free, though sometimes the paid versions have more automation features such as removing spyware on receipt rather than requiring a manual scan. None will find every piece of spyware on your system, since they rely on a database which has to be populated according to someone’s judgment. And, one man’s spyware is sometimes another’s welcomed advertiser.

Some spyware is notoriously difficult to remove. They may make several alterations to your system settings and install files in different places. Often the only way to remove this type of spyware is to find the locations of all the files and manually delete them.

Needless to say, this should be performed only by skilled users. Deleting the wrong files can damage your programs and even your operating system.

Once your system is spyware free - help keep it that way. Some of the spyware removal tools include utilities that can protect your computer from being exposed to spyware. Much like virus scanners, they monitor changes to your system files and alert you of any suspicious activity.

And, of course, beware those tempting looking free offers. You may get more than you bargained for.