Download BitDefender 10 Free Edition

BitDefender Free Edition is your chance to use one of the world's most effective antivirus engines for free!
BitDefender Free Edition uses the same ICSA Labs certified scanning engines found in other BitDefender products, allowing you to enjoy basic virus protection for no cost at all.
BitDefender Free Edition is an on-demand virus scanner, which is best used in a system recovery or forensics role.
Features and benefits include: 
Virus scanning and removal  
On demand scanning - Powerful scan engines ensure detection and removal of all viruses in the wild every time you need it.  
Scheduled scanning - The Scheduler lets you plan ahead, and schedule full system/drive scans in the off hours, when you won't be using your computer.  
Immediate scanning - With just a right click you can check your files and folders.  
Skinable interface - You can express yourself, designing new interfaces, or you can use those drawn by others.  
Quarantine - By isolating the infected files in quarantine, the risk of getting infected diminishes. You also have the possibility to send these files for further analysis to BitDefender Labs.  
Reports - When launching a scan you may choose to create a report file where you can see statistics about the scan process.
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http://download.cnet.com/BitDefender-Free-Edition/3000-2239_4-10322483.html

Download Malwarebytes Anti-Malware 1.50.1

Malwarebytes´ Anti-Malware is an easy-to-use, simple, and effective anti-malware application. Malwarebytes´ Anti-Malware can detect and remove malware that even the most well known anti-virus and anti-malware applications fail to detect.
Features:
Support for Windows 2000, XP, Vista, and 7 (32-bit and 64-bit).  
Light speed quick scanning.  
Ability to perform full scans for all drives.  
alwarebytes´ Anti-Malware Protection Module. (requires registration)  
Database updates released daily.  
Quarantine to hold threats and restore them at your convenience.  
Ignore list for both the scanner and Protection Module.  
Settings to enhance your Malwarebytes´ Anti-Malware performance.  
A small list of extra utilities to help remove malware manually.  
Multi-lingual support. 
Works together with other anti-malware utilities.  
Command line support for quick scanning.  
Context menu integration to scan files on demand.
    Note from FreewareFiles: The free version does not include realtime protection, scheduled scanning, and scheduled updating

    http://download.freewarefiles.com/files/mbam-setup.exe

    Download Avira Antivir Virus Definition File Update | 04-05-2011

    Update AVIRA Desktop for Windows with latest virus definitions and scan engine.
    Manual Update of AntiVir
    Please go through the following steps to update your AntiVir Personal Edition Classic / Premium on a PC without internet access
    • Download the latest virus definition file (IVDF) on a PC with internet access.
    • Copy the downloaded file to a portable media storage such as an USB Stick or a CD-ROM for transferring it to the PC without internet access. Note: Extracting of the ZIP file is not necessary.
    • Insert the media storage into the PC without internet access.
    • Start AntiVir Personal Edition Classic / Premium and go the menu „Update“ and select „Manual Update“.
    • Select the downloaded IVDF file from your media storage and click „open“.Your AntiVir PersonalEdition Classic / Premium is now up to date. /ul>
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    http://dl.antivir.de/down/vdf/ivdf_fusebundle_nt_en.zip