Security diagnostic tool for Windows systems.
Microsoft's free antivirus aimed at both beginner and advanced users.
Small program that detects the presence of any type of keylogger on your system.
Open source anti-malware security software designed to detect and remove malware and other threats.

Protect your computer from possible threats from USB devices.
Portable and free tool that allows diagnosing and resolving issues in Windows systems caused by malware or other failures.