Free unknown viruses software for windows

Protect your PC from existing & new viruses, trojans and spyware for FREE. Active Virus Shield combines traditional antivirus defense methods with the latest technology to detect and stop viruses and spyware before they can infect your PC. Active Virus Shield combines traditional antivirus defense methods with the latest detection technologies to stop viruses and spyware before they can infect your computer. With Active Virus Shield, you get real-time protection as you access files on your computer or in your emails. Active Virus Shield scans all HTTP Internet traffic, in real-time, for viruses. This means that files and other malicious software are repelled before they can be saved on your computer. Active Virus Shield controls any unauthorized file and registry changes. Above all, Active Virus Shield has a very small response time (usually less than 2 hours from when a virus is discovered) which better protects you in case of a virus outbreak. The software utilizes advanced heuristics for detection, and is simple and easy to use. Best of all, by utilizing sophisticated technology to optimally share processing power with other applications, Active Virus Shield allows you to continue with other tasks without slowing you down. Active Virus Shield also offers a number of additional advantages for laptop users, including economy mode to conserve battery energy and WiFi (wireless) Internet access to automatically update antivirus databases.

F-Prot Antivirus for Windows is an easy-to-use multi-component security software package protecting your system at all times against viruses, Trojans, worms and other malicious software.
F-PROT Antivirus can detect a total of 463073 worms, viruses and other malicious programs with these latest virus signature files.
Version 6 of F-PROT Antivirus can as of 31 May 2007 detect a total of 594486 worms, viruses and other malicious programs with its latest virus signature file. This number differs from that of other versions of F-PROT Antivirus due to differences in design and structure.
All versions of F-PROT Antivirus also use advanced heuristics to detect new and unknown viruses.

Comodo AntiVirus Eliminates ALL known Viruses, Worms and Trojans from desktops and networks Developed by one of the world?s leading IT security providers, Comodo AntiVirus leverages multiple technologies (including on demand & on access scanning, email scanning, process monitoring and worm blocking) to immediately start cleaning or quarantining suspicious files from your hard drives, shared disks, emails, downloads and system memory.
Updated virus definitions are automatically downloaded according to a schedule that you choose or by one click on the updater button. Once installed, Comodo AntiVirus will unobtrusively stay in your system tray, silently and efficiently defending your system from the latest and most dangerous virus outbreaks.
Main features:
- On Access Scanning - Always on, real-time protection against threats
- On Demand scanning - Take control by running instant scans on any file, folder or drive
- Automatic Daily Updates - Up-to-the second protection against the latest threat
- Email Scanning - Automatic checking and disinfection of incoming and outgoing mail
- Process Monitoring - Continuously scans your PCs memory for viruses
- Worm Blocker - Monitors and intercepts suspicious mass mailing attempts
- In-depth Reporting - Comprehensive logs of all scans performed
- Pro-active virus defense - Submit suspicious files for analysis by the Comodo AV team
- Easy, User Friendly interface - Sleek design provides fingertip access to all major settings
- Scan Scheduling - Timetable scans to run when you choose
- Dedicated Quarantine Facility - Isolate suspected files where they can do no harm
- Advanced Heuristic detection Engine - Protection against unknown viruses
- Scan Removable Devices - CDs, DVDs, external drives, USB devices, digital cameras
- Scans Network drives - protection from any potential threats on your network
- Scans Compressed Files - theres no hiding place for viruses, even in a .zip file
- Does not hog system resources - Maximum Protection with no slow down of your PC
System requirements:
- 50 MB available space on your hard drive
- 128 MB RAM
- Intel Pentium 300 MHz processor (or equivalent)