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Free Microsoft Security Tools
Microsoft provide a number of free security utilities for the home user. Below is a list of some of these. There may be better tools than these, some of which are also free but these security tools are provided by Microsoft.
Windows Live OneCare safety scanner is a free service designed to help ensure the health of your PC.
Windows Defender is software that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software by detecting and removing known spyware from your computer. Windows Defender features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected, minimizes interruptions, and helps you stay productive.
This tool checks your computer for infection by specific, prevalent malicious software (including Blaster, Sasser, and Mydoom) and helps to remove the infection if it is found.