Free Tools To Fight Against Viruses, Spywares And Other Malwares

Ad-Aware Free Internet Security
Ad-Aware Free Internet Security features real-time protection, advanced genotype detection technology, rootkit protection, automatic updates, and much more — to ensure that you have the power to protect yourself online.
Features

Comprehensive Malware Protection
Ad-Watch Live! Basic Real-time Protection
Genotype Detection Technology
Behavior-Based Heuristics Detection
Rootkit Removal System
The Neutralizer Malware Removal Tool
Download Guard for Internet Explorer
The Scheduler
Easy to [...]

Free Rootkit Detection And Removal Tools For Windows

GMER
GMER is an application that detects and removes rootkits .
It scans for:

hidden processes
hidden threads
hidden modules
hidden services
hidden files
hidden Alternate Data Streams
hidden registry keys
drivers hooking SSDT
drivers hooking IDT
drivers hooking IRP calls
inline hooks

Supported Platform: Windows NT/W2K/XP/VISTA
Website: http://www.gmer.net/
F-Secure BlackLight
F-Secure BlackLight is a tool that detects files, folders and processes hidden from the user and other programs. BlackLight is [...]

Free Online Malware Scanners

Scanning With Multiple Antivirus Engines
Filterbit
Filtebit (powered by Metascan) enables you to upload files for scanning, analysis and identification by multiple antivirus engines.
Antivirus Engines: 11
Website: http://www.filterbit.com
Jotti
Jotti’s malware scan is a free online service that enables you to scan suspicious files with several (around 20) anti-virus programs.
Antivirus Engines: 19
Website: http://virusscan.jotti.org/
NoVirusThanks
NoVirusThanks allows users to upload and scan a [...]