If you do not have a specific, clear reason to want and trust the software you are being asked to install -- that is, if it is not the Macromedia Flash Player or the Adobe Acrobat PDF Reader or something similarly crucial that you really need -- SAY NO! Many nasty pieces of awful spyware are properly signed and will ask permission to install, knowing that some people will naively give it. You do NOT, for instance, want to say yes to installing things like "WeatherBug" or "MemoryMeter," among many others. For more information about removing such programs you may have installed by mistake, see why is my web browser broken?
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