The source of infection is primarily when the spyware downloads itself. This usually happens when you are downloading from the internet, which means that the Internet is the route of contamination. However, other sources such as storage devices and local area networks are also contributors to this malicious software. It is natural for users not to install any program or utility if they feel that the installation will disrupt the performance of the system. This is why it is necessary for spyware to deceive the user in order to be downloaded onto the system.
Unlike viruses spyware does not spread from computer to computer. An infected system does not transmit it to another computer. It just covertly resides in the operating system and loads itself to the system memory to run in the background carrying out its deadly task of compiling user information and personal data such as usernames and passwords as well as credit card information.
Yet like the virus it makes entries in various parts of the registry in order to operate. This slows down the system and must be cleaned with a spyware virus removal tool from time to time in addition to using registry cleaner utilities to secure the system.
Spy-ware does this by attaching itself to a download or by tricking the user into installing software it is a part of. The ultimate result can be pure disaster. Therefore it is important to install computer spyware removal utilities on the system to beef up the system security and carry out regular maintenance of the registry with software such as free Microsoft spyware removal and computer spyware removal tools.