An individual who uses a computer with an Internet connection pretty much practices caution when downloading programs from the Internet and email because of the threat of viruses and worms. Anti Spyware
These malicious program codes and programs can cause your system to become unstable and worse yet, after it has spread within your system, it further infects other systems connected to yours.
Spyware in mild cases infringes on your privacy because it can track and take note of your usage patterns and these information are reported back to the company that created the spyware so that they can build marketing profiles. Anti Spyware Software
More than that though, some spyware have the ability to register and take note of key strokes, scan documents within your computer’s hard drive, and can steal your passwords and other sensitive information that can make you the victim of identity theft and other situations where your personal information can be used to compromise your security.