1. For multiple engines, online scanners, visit, http://itskrat.wordpress.com/2009/01/17/malware-scansmultiple-engines-online-scanners . For details of virus attacks, visit www.viruslist.com/en/virusesdescribed .

2. To protect from virus affecting through USB, create a folder named “atorun.inf”.

3. To protect your PC from spywares, browser hackers, and other virus spyware blaster is very useful. Download it from www.javacoolsoftware.com/sbdownload_free.html . For protecting from malwares, visit www.malwarebytes.org .For installing firewalls, visit   http://personalfirewall.comodo.com/download_firewall.html .

4. For avg antivirus, visit www.avg.com . For avast, visit www.avast.com .

5. Visit www.scanwith.com to get a no. of anti virus soft wares which are almost free. Download them by links as you like.