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One of the worst causes of problems in personal computers these days is the prevalence of spyware and adware. Spyware and adware are two types of malicious software (AKA malware) that infect PCs. Unlike other malware like viruses and trojans, spyware and adware don't exist to cause damage directly, but to collect information about a user's surfing habits, purchasing preferences, etc.

and send it to marketing agencies (spyware), or to serve advertisements to the user, often making them appear as if they are normal pop-ups encountered while surfing the web (adware). Both these types of malware consume CPU cycles, memory, and network bandwidth, causing degradation in system performance and stability. Severe infections can make surfing the Internet impossible or even render the entire system unusable. On top of that, spyware serves as an invasion of privacy, because the data collected can be used not only to target you with unwanted advertising, but quite possibly in identity theft operations.

The source of these infections can be email attachments, or files downloaded from the Internet disguised as (or embedded within) useful software. Some adware and spyware can also be picked up simply by surfing to certain websites.

Removal of this type of malware is usually accomplished with the aid of utilities written for this purpose. There are free and commercially products available, each with their own set of strengths. Spybot Search & Destroy (safer-networking.org) and Adaware (lavasoft.de) are two long-standing products which offer free versions for personal, home use. Running scans with both these products, one after the other, will allow you to effectively remove most malware. Some objects however embed themselves so deeply within the operating system that these two tools cannot completely remove them. There are a number of other tools available for dealing with these nefarious objects, each customized for the particular type of infection they're designed to combat. For example, CWShredder (us.trendmicro.com) was designed to remove a rather insidious form of web browser hijacker, which redirects your searches, changes your home page, and creates bookmarks to other sites. Another tool for combating hijackers and other malware is hijackthis, also from TrendMicro. Both of these tools are for experienced, technical users. You have to know specifically what you're looking for. This is especially true of hijackthis, which will happily let you remove components

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