Specialized program for removing rootkits.

Small utility that has the functionality to protect your pen drive.
Free utility that detects and removes adware, hijackers, toolbars, and PUPs from your browser.
Free antivirus from Microsoft aimed at both beginner and advanced users.
Free software for Windows that operates via the command line, allowing you to scan for and remove malware.
Software that automatically scans and removes Windows malware.